Mikuni jet needle chart There are No checkout buttons on this page. This can be done by adjusting the carburetor’s pilot jet, needle valve, and main jet. 5 12006 12001 15 15007 15001 15005 15015 17. 0 GENUINE MIKUNI NEEDLES. 00 AUD – $ 27. 432 30 0. Therefore, needle jets and jet needles act together as the main system in controlling the amount and mixture of the fuel which is drawn in mid-range (1/4 - 3/4) throttle operation. We recommend that if you are a novice, To visualize how the various OK, so it turns out the Mikuni needle chart is an interactive file. Carefully remove the existing pilot jet with a screwdriver or needle-nose pliers. 927 120 0. MIKUNI NEEDLE JETS. 697 70 0. 886 110 0. I searched all over as well and didnt find nothing over series 8. mikuni almost should have just named them something totally different. Ryan N. MIKUNI NEEDLE JETS (Emulsion tubes) ARE IDENTIFIED BY THE THREE DIGIT NUMBER STAMPED ON THEM, THIS IS THE MIKUNI SERIES NUMBER. It acts as a fine tuning component in regulating the fuel-air mixture. That’s where the Mikuni Pilot Jet Drill Size Chart comes in handy. 7mm ID JRU-8037B. 5 17006 17001 17009 They are manufactured from brass for a long and reliable life. But it had an odd lack of effect past 3/4 throttle. If you need to change your needle jet contact us at support@pjmotorsports. / I wrote this spreadsheet that lets you input various jet needles, say a 6DP1 or a 6F9 and needle jets say a P6 or N1 and it will graph the area of the jet. 650 mm. jpg Thanks allot bb454. There are two types of needle jets: primary and bleed. Lean to Rich Chart Size N-0 Lean N-2 N-4 N-6 N-8 To lean the fuel mixture the ‘E’-Clip is raised on the Jet Needle. 835mm so if your needle jet is not removable and is impossible to measure then just use that diameter by entering S-7 at E5. 8 emails,none returned. 020” and . Reply. 159, 171, etc. 387 25 0. Application , Std. e. All Motorcycle Brands; BMW Carb Kits; Description. Slide Cutaway. 041" Here is a chart I found that may help. Go. 9mm for PWK33-39, PWM38, PJ34-38, PE36, FCR28-41 2. VM28/486-(size) Pilot Jets, sizes 15 to 50 N100. 6mm for PE26-28, PWK26-28, PE20-24 Heres what PWKs are often equipped with: Needle Data for PJ34-38 PE35-38 PWK33-39 PWM38 from Jets R How/why I developed this method: I have about 10 years tuning 2 strokes and can usually get the jetting close enough but recently I bought a bike and changed the idle and main jet so it ran really good and gave a perfect colored plug and ran really crisp all thru the rev range. Mikuni VM Series Needle Jet Dimensions Specifically mainjet, needle jet, needle type and e-clip position/groove. Index. It's INCORRECT. 797 90 0. pdf), Text File (. Thanks yzdoc that is what I currently have installed in the carb. MIKUNI JETTING - GENERAL. Mikuni needle jets. PILOT JET PART #: 09492– SHOWN BELOW PILOT JET SIZE TYPE CODE VM22/210 VM22/140 BS30/96 N100606 N101043 VM28/486 M28/1001 N106340 12. This is especially important when a bleed type needle jet is used. 5 turns out Stock needle 2nd clip Mikuni Carburetor Tuning for Vintage 2-strokes Overview - There are many manuals and resources that offer tuning info for Mikuni “Round-slide” carbs, but most lack “real world” explanations of how to do the proper preparation along Mikuni Needle Chart. Flow Diagram. Example Mikuni TMS needle: 6DEY26-66 The first 6 is the length, which in Mikuni carburetor. Used to modify GT750 Suzuki CV carbs for anti-surging Chart 1 subtracts the area of a jet needle at a given point from the area of a selected needle jet. W. See our Mikuni jetting chart here. 986 140 1. How to Videos; MIKUNI MOTORCYCLE KITS. More Bikes. Jump to Latest 3. Steve) The needle that is held in place with a circlip and has the two spacers, is the "jet needle". With this knowledge, they can choose the correct pilot jet drill size for their specific bike and riding conditions, ensuring that their motorcycle runs smoothly and efficiently. N–5, Q-3 The needle jet is the main fuel passage to the main bore (venturi) of the Mikuni carburetor. Mikuni Jet Needles Competition Racing Overall Leaner 1 5EP8 5DP2 5DP2 2 5EJ11 5DL13 5DL13 3 5EL9 5EJ11 5EJ11 4 5FL11 5EL9 5EL9 5 514 5EP8 5EP8 6 5DL13 5FL11 5FL11 Quick Reference Chart for Needle Selection (average Performance Chart) Needle #4 Series Competition Racing Overall Leaner 1 4D8 P3 2 4DH7 4D8 4D8 3 4DG6 D3 4 4P3 4F10 4DG6 Listings of all the Mikuni VM needles: Sudco NicheCycle. 843 100 0. Thread starter voelser; Start date Dec 1, 2017; 1; 2; Next. 005mm greater then P-4. 5 pilot jets Mixture screw: 2. Part way down page are needle specifications. When opened you can see two charts. The taper of the needle increases the clearance between the Jet Needle and the fixed Needle Jet outlet as the throttle is opened. Main jet size numbers do not all yield the same flow for different style jets, ie, #100 Large Round Reverse has different flow than #100 Large Hex. Needle jet sizes are designated by Mikuni series numbers and Jets: Mikuni 155 left main, Mikuni 160 right main, Mikuni 22. The primary choke height atop the needle jet is also a factor. My TMR32 had wrong needle which was impossible to get right despite changing all other jets. 9. I suggest always using a mikuni main jet as the sizing is standard. This style of jet has its fuel flow calibrated in the “wrong” direction i. 511 40 0. Keihin needle shims . Throttle Position Circuits. The needle jet is where the jet needle slides into. 474 35 0. Fraser in Toronto . 50 AUD; 1. 749 80 0. The charts change accordingly to show the cross-sectional area nozzle - "Düsenquerschnittsfläche" and the Here's the chart showing the inner diameters of the jet holes: This shows what needle jet series is used in each model carb and which ones are available from SUDCO. Needle Diameter Spreadsheet. Selection Guide: Often we are asked what needle to use when an OEM needle is no longer available. Top Left side - This is a picture of the needle jet area of an emulsion tube from a stock 38mm CV Mikuni carb as installed on Ducati, Yamaha TDM/TRX 850, YZF750, FZR1000, etc. Order No. KEIHIN NEEDLE. Pilot Jet 9 * 12 in-lbs. ) JET (J8-) JET #568 All Mikuni AS Series Carburetor Kits are designed to be a bo~-on application, first refer to the carburetor specification chart in this Note: Main Jets have different threads and are not all interchangeable. 5 18mm #80 #30 145O0 4J13 None 3. Mikuni VM Carb Data . This is way more than enough wear to cause overrich low speed problems . mikuni-carb-jet-size-chart. N–5, Q-3 I’m officially ending my hunt for information on the significance of the final numeric code of Mikuni jet needle descriptors. HS40, TM36, TM40 BS32/126 002-455 HSR42/45/48 BS32/126 002-455 RS34-RS36 VM20 Sudco Carburetor Needle Shims Jet Needles Mikuni No. Exploded View. Look up your needle and compare with other if needed. When checking the float height, the float should be resting, If the calibration is lean from 1/4 to 3/4 throttle, raise the JET NEEDLE by lowering clip position, or use JET NEEDLE with shorter length (L1). VM needles: Here's the chart Number of tapers - The needle can have one or more tapers; the number of tapers is not usually changed. 5 Idle screw 2 Air Jet 3. Chart. 1 of 2 Go to page. #6DH2 002-299 #6DH3 002-300 #6DH4 002-301 VM34-168, VM34-275, (Std. To richen the fuel mixture the ‘E’-Clip is lowered on the Jet Needle, raising the Jet Needle. The chart below showing dimensions of some 7 series needles may be of assistance in determining Mikuni 16 Compartment Plastic Jet Box $ 17. Effects of Jetting Variables. The way Mikuni Needle numberings work is: The first number is the length series. jpg. The hi-speed circuit mixture is effective at 3/4 to WOT. How it overlaps with the jet needle depends Proudly Australian . These Mikuni needles are oddly shaped to and sit well into the needle jet. With this calculator, you can plug in your existing jet needle and needle jet and it will give you a value at every 10mm increment along the profile of the jet. It has approximately ~5000 miles or 8000k usage on a Ducati or TDM 850 - WITH A Mikuni has got to have to have the worlds worst customer service. S-7 has an inner diameter of 2. For needle shims see fastener Dont see the needle you need below, check carb rebuild kits. 1) Float Height : The float height controls the fuel level in the float bowl, To modify the needle position, begin by removing the top cap of the assembly to access the needle jet. Where as Keihin Carbs its recommended (if necessary) you change the Needle first. To richen Needle & Seat Assemblies (Needle valves) Choose the top flow hole diameter from the sales drop down list in the product file of the one you identify to match what you have removed from your carburetor. I've already put my order in to Allens Performance for the P6 and 6F9 jet and needles as it was the most common touted baseline and they seemed leaner than the P4 and 5F3 combination. The ‘E’-Clip can be raised or lowered on the Jet Needle. Mikuni are discontinuing many needle profiles every month so some may be listed but are no longer available. I was finding that go rich on the clip and it’d go super rich even at no throttle- it’d drown. Information from Mikuni indicated that the number before the dash is a production code If you look carefully at any needle jet that you have, you will see two sets of numbers stamped on the body (assuming it’s a genuine Mikuni needle jet): 1) the upper three digit number identifies which type of needle jet it is e. 1024-36 CR 26-33 CR 35-39 CRS 26mm-33mm CRS 35mm-39mm CVH Harley Davidson FCR 28-33mm This is a list of Mikuni needles I have in stock and currently listed by Mikuni as available. Hi-Speed. The chart will not be a perfect match because there are many variables, for example, different carb flow characteristics, different needles, orifices etc. 6 mm Idle Mixture screw turns out - 1-1/2 float Height* - 14. needle Jet 14 * 16 in-lbs. 00 AUD; Mikuni 640 Series Needle Jets $ 33. Once exposed, locate the needle clip, which is adjustable along several grooves on the needle. Mikuni "Emulsion" Tubes / Needle jets . BP Needle Jet Size Chart. Bikes. The table of orifice diameters below is Mikuni published data. Click on these links for a "hot lap" of the TZ350 and 250 Website: Mikuni Needle Jets. For example: the thinner the diameter of the needle, the more Mikuni Jet Identification Chart. Mikuni needle clips. A computer needed with Excel. GENUINE MIKUNI NEEDLE JET 723 Z-0 (SKU 003-689) C. Part Number: MKU-J8-6DH02. All the tuning parts besides the main jet are totally different. Mikuni Jet Needle- 8 series (All available shown in sales drop list) $ 27. As Jet Size CC/Min Jet bore 10 0. 73 KB Views: 4,344. D. Mikuni BS30/97 Air Jet £5. Find the specifications and order the needle for your Mikuni carburetor. He was informed that it was now called a 6DP17. Shown in the Above Diagram and below on the Mikuni Catalog Pages are the operational ranges that the different jetting systems (Main Jet, Jet Needle, Needle Jet, Throttle Valve, and Pilot System) work in relation to the throttle slide position as it moves up and down inside the carburetor's throttle bore. but it is a starting point. On the following application chart, it is noted that certain needle jets require a specific type of main jet of needle jet size P-5 is . My needle is the stock 6BFY43-75. One's for carbs under 24mm aren't available. Needle jets are threaded for specific main jet types. Needles are constructed such that a given point on a needle, (for example, at 3/4 throttle opening), the needle may be found to perform richer at this given point when compared to the same given point on another needle, but according the the average performance chart, the needle should perform leaner. Tuning a Mikuni carburetor requires adjusting the air/fuel mixture to match the engine’s requirements. 907 115 0. J8-8CFY02-(size) HSR45 Jet Needles same as above I ask this question because i would like a needle that is a step bigger at the first cylindrical diameter with the same taper that i have now. 040” increments. Needle Jets Mikuni - Free download as PDF File (. Needle Diameter Graph Spreadsheet. 947 130 0. NEEDLE/JET KIT - Yamaha XV650 V-Star 650 1998-2010 8. ) (O. Depending on the inside amount and mixture of the fuel which is drawn in mid-range (1/4 - 3/4) throttle operation. I believe the TM-38 carburetors used on 2000 to 2001 ZRT-800 and T-Cats to be P-0 or 2. MIKUNI NEEDLE. Search. 773 85 0. As the slide moves, the jet needle goes up and down in the "needle jet", sometimes called an "emulsion tube". 2) the lower two-character alpha-numeric identifies the size of the needle jet e. 641 60 0. Moving the clip to a higher groove (closer to the needle’s tip) will lean out the mixture, while positioning it lower will enrich the fuel mixture. If you go by this table, you will end up with a needle jet approx 3 sizes richer than the one you're aiming for. 7mm ID JRU-8027A Needle shim 3. After the carb swap to a keihin carb start with keihin 110 jet. Needle Taper Diameter Note: Main Jets have different threads and are not all interchangeable. 10. Mikuni 169 Series Needle Jet $ 22. List is offered as a reference only. 5 turns left carb, 2. Motorcycle carburetors look very complex, but with a little theory, you can tune your bike for maximum performance. How Much Power Does the 2025 Honda Rebel 1100T Make? Bikes. ) #6DH7 002-302 #6DH8 002-303 High speed (main), low speed (pilot) jets, jet needles and accelerator pump nozzle for the HSR42/45/48 carburetors. One's for For example lets suppose that a Mikuni carburetor has a size 100 main jet in it, the equivalent Keihin jet would be a 110. 670 65 0. 2mm ID JRU-8032 Needle shim 3. . Needle Diameter Chart. Operation. I have attached a Mikuni needle jet sizing chart that shows the ID # and the orifice diameter in mm. Specifically mainjet, needle jet, needle type and e-clip position/groove. What I am asking for is the piece that I have pictured in my previous post. It includes the needle jet, jet needle, and, to a lesser degree, the slide. Re: MIKUNI JETTING info TM24 TM28 35mmTMX TM24 flat slide. NEEDLE JETS Here's the chart showing the inner diameters of the jet holes: This shows what needle jet series is used in each model carb and which ones are available from SUDCO. Mikuni VM Series Needle Jet Dimensions Shown in the Above Diagram and below on the Mikuni Catalog Pages are the operational ranges that the different jetting systems (Main Jet, Jet Needle, Needle Jet, Throttle Valve, and Pilot System) work in relation to the throttle slide position as it moves up and down inside the carburetor's throttle bore. 7K views 4 replies 2 participants last post by RJH Mar 15, 2006. Available in twin carb or triple carb kits. Others not listed may be available to order. 273 15 0. See less here conversion chart between (left) mikuni (right) dellorto THE FIRST DIGIT IN A MIKUNI NEEDLES NUMBER REFLECTS IT'S SERIES NUMBER IMPORTANT MIKUNI TUNING CHARACTERISTICS The Mikuni Jet Needle is the tapered rod that is positioned in the throttle valve by the 'E'-Clip. As for the needle chart, The 100 main jet with the needle in the middle position bogged down and killed the engine at any throttle position. I found an Excel file where Mikuni needles can be compared with each other. rev_man Buy Mikuni 159 Series Needle Jet for VM30-VM36 Carburetor - P-2 VM34/05-P-2: Carburetors - Amazon. 030” precision cut shims allow calibration in up to 20 different needle positions. The Mikuni chart below provide a comprehensive listing of the needle jets available for their round-slide carburetors. The needle jet is the main fuel passage in a Mikuni carburetor and controls the amount and mixture of fuel drawn in during mid-range throttle operation along with the needle. Throttle Position Circuit Adjustments Keihin needle jet inner hole diameters 2. The position of the ‘E’-Clip in the Jet Needle is used to correct or change the air/fuel ratio between 1/4th and 3/4th throttle valve position. Please Note: Other than exact replacement OEM carburetors, all Mikuni Aftermarket Carburetors and Tuning Components are sold “As Is” for Off Road / Racing Use Only and are not intended or approved for use on vehicles operated on Public Roads or in Locations where applicable engine tampering and anti-pollution laws apply. 604-(size) Main Jets, sizes 140 to 240 J8-8DDY01-(size) HSR42 Jet Needles, size 95, 96, 97 and 98, standard in HSR42 is 97. NEEDLE JET: The needle jet/nozzle controls the fuel/air mixture up to 3/4 throttle. A clean Mikuni carburetor with a properly adjuste Tuning Tips & Manual Downloads . Always rich AND lean somewhere. Shimming the USA needle will work, but is not as good as the 6F19 needle because shimming the needle results in more preload on the slide spring, effectively lowering the slide for a given throttle position. With this chart, you can figure out the right drill size to use when you’re replacing your pilot jet. ive also tried the mikuni needle letter refrence but it does not tell all the info needed for the 9 series needles. A friend mentioned today that he had a 6DP5 needle that he could not find in his current Mikuni needle literature so he called Mikuni and inquired about it. If 6BFY is the taper, they all have the same taper in my chart and what i have trouble to understand, is how can it be the same taper when diameter is not the same. I finally found correct needle and a seller that had in stock. 65mm up from the base on both D and K jets. If the calibration is rich, lower the JET NEEDLE with a Jetting Mikuni Slide Carburetors. Note: needle jets remain the same internal diameter for their entire length. 0 20mm #180 #22. 75-3 turns right carb Needle settings: Factory needle settings With airbox lid removed/modified with EHS Racing lid Mikuni Jet Needles; Mikuni Throttle Valves; Mikuni Threaded Carb Spigots; Mikuni Pilot Jets; Mikuni Jets; Mikuni Needle Jet; Accelerator Pump Nozzles; Mikuni Spare Parts. The mikuni carbs have a third jet that is press fit into the main body which the Mikuni "VM" Factory Carb Specs Jetting Specs ~ Carb Body Specs Throttle & Cables, Fuel Line, Reed Valves ~ ~ ~ JETTING Carb Size Main Jet Pilot Jet Needle Jet Jet Needle Air Jet Slide Cutaway 16mm #70 #25 165O8 3DJ3 None 2. This jet is identified by the numbers 159 being stamped on it but you may also find that there are other needle jets that though having a different series number stamped on them, are in fact identical to the 159 and thus interchangeable. Mikuni VM Series Needle Jet Dimensions Jet Needle E-Ring (Clip) Application Mikuni No. 20 each Meters the air flow through the passage to and into the needle jet. The needle availability list you look at elsewhere on the web may be up to 20 years out of date. I have what I think (thought) is a simple question: 1998 MXZ 500 Jet Needle Compatibility Hello I have a 1998 MXZ 500 that I got from my grandpa last year. 010”, . You may also find that there are other Mikuni needle jets that though having a different series number stamped on them and not listed on this page, are in fact identical in dimensions to another shown here and thus Created Date: 12/9/2005 3:29:44 PM It’s also Mikuni type 4/042. This is a list of jet needles for Mikuni TM38/40 carbs offered by OEM Manufacturers. VM16-519 Mikuni Tuner Kits for 2 and 4-Stroke Engines Variables in needles: Overall length Taper Distance from clip position to taper begining. See Chart at top of box for proper jet sizes and needle slot/clip position. 820 95 0. 335 20 0. g. 723 75 0. The mixture is, almost all, controlled by the main jet size. thanks again. 3 Fuel inlet valve 20 Pilot Jet 22 Float Height to properly tune the VM's it's critical you get the Pilot and air mixture set properly at idle before you do anything else. 023 Read More » If only a "minor" change is needed, a needle with a different taper combination, a different throttle slide, a different number needle jet (yes, they can be changed), larger pilot or air jet/screw change might be a better idea. Depending on the inside diameter of a specific needle jet, this will also effect the function of the needle. It is located in the slide that is part of the diaphragm assembly. 5 239O6 4D20 0. Jet needle (by Mr. Thoroughly clean the inside of the float bowl prior to reinstalling it. The taper of the needle determines the amount of fuel. Main jet: 158 Pilot Jet: 45 Air screw (turns out): 1 1/2 winter 1 3/4 summer Needle model/Clip position: n3we (stock) 3rd position Altitude where you ride: 0-500 ft Temperature: winter ( 20 derees celsius (68 f) /summer 35 degrees celsius (95 f) 42 pilot jet Air screw 1. Major diameter where it interferes with the needle jet at idle. Skip to; Works as advertised lettering is a little confusing so you Mikuni Motorcycle Carburetor Theory 101. The chart below showing dimensions of some 4 series needles may be of assistance in determining alternative options. 547 45 0. Adjustments. By Kevin Cameron. Mikuni Genuine Carburetor Jets To select a jet type “HOVER” over Jets on the menu to the left of the screen and click on your relevant selection from the drop down list. 00 AUD; Sale! 5 series Mikuni Needles (All available shown in sales drop list) $ 18. See bottom of page to order the needle. Main Jet 9 * 11 in-lbs. See the needle taper diameter dimension chart and the needle series codes for different Mikuni models. Attachments. It's important to note that the jet needle has and effect on the widest part of the powerband. PART NUMBER: PICTURE: If you go by this table, you will end up with a needle jet approx 3 sizes richer than the one you're aiming for. i guess ill jst have to buy 1 of the needles that i dont have and measure/compare to the ones i have. Jetting Fine points of CV carb internals - Needle jet vs. 611 55 0. 5 (Fixed) 2. For example: Average Performance Chart Richer Jet Designations D= DynoJet, K= Keihin, G= Generic, M= Mikuni Orifice mouth is approximately 2. Note bold items are unresolved errors in the manufcturer part lists. You also need a main jet to suit your airbox setup. If you could get it to run it’d be superb and strong from 1/2 throttle but Mikuni and Keihin CV (carburetors with movable jet needles) The following tips and insights are for your information only. This size is an actual mm It is recomended to first change (if necessary) your needle jet on Mikuni carburetors. I finally figured out that the needle taper was too steep which Motorcycle enthusiasts who want to improve their bike’s performance, fuel efficiency, and overall rideability should understand how to use the Mikuni pilot jet drill size chart. The needles that have multiple letters, like the 9DFH10-57 example, have multiple tapers. 580 50 0. Keihin needle clips. Mikuni 6 Series needles can help to improve the performance of your motorcycle or ATV, keeping your ride running in peak Carburetor Jet Needle, Powersports, Mikuni, Brass, 6DH2, Each. ) Here's what Mikuni VM's typically are equipped with. 50 AUD; MK-412 Cable Starter Kit, Mikuni TM & VM If you look carefully at any needle jet that you have, you will see two sets of numbers stamped on the body (assuming it’s a genuine Mikuni needle jet): 1) the upper three digit number identifies which type of needle jet it is e. Mikuni needles Needle shim 2. Mikuni Float bowls; Mikuni Baffles; Mikuni Nozzles; Mikuni Floats; Mikuni Float Arms and Pins; Mikuni Tickover Screws; Mikuni Drain Screws; Mikuni VM 30 Roundslide carbs 150 Main Jet 2. Estimated Ship Date: May 12, 2025 if ordered today Mikuni TM34 jetting. com or give us a call at 503-873-8992 with the order number MIKUNI KIT APPLICATION ENGINE CARB SPACING SPIGOT MAIN JET NEEDLE NEEDLE PILOT PILOT -NUMBER ·(GENERAL) MODIFICATIONS (Throttle Shaft No. The chart below showing dimensions of some 5 series needles may be of The jet needle controls the fuel mixture in the mid range throttle position which is approximately 1/4 to 3/4 throttle opening. To lean the fuel mixture the ‘E’-Clip is raised on the Jet Needle. There are numerous versions of each jet type so the removal of one (The Mikuni needle data on my spreadsheet is even better than what they list because it has corrections for obvious errors they made in copying. 60 AUD; 6 Series Mikuni Needles (All available shown on sales drop list) $ 27. txt) or read online for free. I have inputed almost all of the 6 series needles. Throttle Position Circuit Adjustments Correct height can be found on the chart. May 1, 2020. The pilot jet regulates the fuel flow at idle and low engine speeds, while the needle valve regulates the fuel flow at mid-range speeds. from the threaded end through the orifice and out what we consider the inlet end. At the top of the page is a box where you can type in some details. These will not make you an expert tuner. > a large part in how a jet functions, but this is a useful chart for Want to know what those screws and jet needle slots do? Tuning Mikuni piston slide carburetors, the basics. Pilot Jet - (slow Jet) #37 Jet needle - CDb 4th notch Main nozzle diameter - 2. 865 105 0. The markings on my main jets from MIKUNI VM29 were obscured so I measured the internal diameter with needles and came up with #106 . ^ D190, D185, K180, K175 ^ For reference, the needle diameter measured PILOT JET (MIKUNI) The table below shows the last five digits of the part number for all the available pilot jets classified by size and type. Remove the OEM Main Jet and Pilot Jet, and replace them with the appropriate Main and Pilot Jets as specified. These sizes are not particularly relevant until you decide to ream a smaller size to a larger size. Using the . 5 Slide cutaway 3rd Jet Needle = 6F4 P-5 Needle Jet = 159 P-5 (primary type 1. See chart below. If you can figure out whether you are rich or lean at certain throttle opening this will let you plot what another jet needle will do. Confirm part number and manufacturer number with your dealer. The number stamped on the jet corresponds to the number of cubic centimetres of gasoline which will flow through the jet when poured in the calibration It includes the needle jet, jet needle, and, to a lesser degree, the slide. Not Yet Reviewed. 0mm Torque specifications bowl screws 17 * 20 in-lbs. We've taken accurate measurements of new genuine needle jets which are on average 3 sizes weaker than the published sizes below. com FREE DELIVERY possible on eligible purchases. MIKUNI HSR42/HSR45/HSR48 Genuine Mikuni! Fits all HSR series carbs Rebuild kits available here! Made in Japan Click here for a HSR tuning and initial set up manual Standard / Factory jetting : HSR42 = 20 pilot / 165 main / 97 needle HSR45 = 25 pilot / 175 main / 97 needle HSR48 = 25 pilot / 190 main / 97 needle Technical Editor Kevin Cameron discusses carburetor needle jet tuning. Needle Information. 50 AUD; Menu. NEEDLE ‘E’-CLIP POSITION. 00 AUD – $ 33. Needle Quick Guide. Mikuni jet needles control fuel metering from 1/4 to 3/4 throttle and have five e-clip positions in . Depending on the inside diameter of the needle jet, it will af fect the jet. kzvzarsgzvdknywogqdubokbaamtatpizazwhppzohcgnuaooucmkdnuqppinbhvsqjevkosqqivijlx
Mikuni jet needle chart There are No checkout buttons on this page. This can be done by adjusting the carburetor’s pilot jet, needle valve, and main jet. 5 12006 12001 15 15007 15001 15005 15015 17. 0 GENUINE MIKUNI NEEDLES. 00 AUD – $ 27. 432 30 0. Therefore, needle jets and jet needles act together as the main system in controlling the amount and mixture of the fuel which is drawn in mid-range (1/4 - 3/4) throttle operation. We recommend that if you are a novice, To visualize how the various OK, so it turns out the Mikuni needle chart is an interactive file. Carefully remove the existing pilot jet with a screwdriver or needle-nose pliers. 927 120 0. MIKUNI NEEDLE JETS. 697 70 0. 886 110 0. I searched all over as well and didnt find nothing over series 8. mikuni almost should have just named them something totally different. Ryan N. MIKUNI NEEDLE JETS (Emulsion tubes) ARE IDENTIFIED BY THE THREE DIGIT NUMBER STAMPED ON THEM, THIS IS THE MIKUNI SERIES NUMBER. It acts as a fine tuning component in regulating the fuel-air mixture. That’s where the Mikuni Pilot Jet Drill Size Chart comes in handy. 7mm ID JRU-8037B. 5 17006 17001 17009 They are manufactured from brass for a long and reliable life. But it had an odd lack of effect past 3/4 throttle. If you need to change your needle jet contact us at support@pjmotorsports. / I wrote this spreadsheet that lets you input various jet needles, say a 6DP1 or a 6F9 and needle jets say a P6 or N1 and it will graph the area of the jet. 650 mm. jpg Thanks allot bb454. There are two types of needle jets: primary and bleed. Lean to Rich Chart Size N-0 Lean N-2 N-4 N-6 N-8 To lean the fuel mixture the ‘E’-Clip is raised on the Jet Needle. 835mm so if your needle jet is not removable and is impossible to measure then just use that diameter by entering S-7 at E5. 8 emails,none returned. 020” and . Reply. 159, 171, etc. 387 25 0. Application , Std. e. All Motorcycle Brands; BMW Carb Kits; Description. Slide Cutaway. 041" Here is a chart I found that may help. Go. 9mm for PWK33-39, PWM38, PJ34-38, PE36, FCR28-41 2. VM28/486-(size) Pilot Jets, sizes 15 to 50 N100. 6mm for PE26-28, PWK26-28, PE20-24 Heres what PWKs are often equipped with: Needle Data for PJ34-38 PE35-38 PWK33-39 PWM38 from Jets R How/why I developed this method: I have about 10 years tuning 2 strokes and can usually get the jetting close enough but recently I bought a bike and changed the idle and main jet so it ran really good and gave a perfect colored plug and ran really crisp all thru the rev range. Mikuni VM Series Needle Jet Dimensions Specifically mainjet, needle jet, needle type and e-clip position/groove. Index. It's INCORRECT. 797 90 0. pdf), Text File (. Thanks yzdoc that is what I currently have installed in the carb. MIKUNI JETTING - GENERAL. Mikuni needle jets. PILOT JET PART #: 09492– SHOWN BELOW PILOT JET SIZE TYPE CODE VM22/210 VM22/140 BS30/96 N100606 N101043 VM28/486 M28/1001 N106340 12. This is especially important when a bleed type needle jet is used. 5 turns out Stock needle 2nd clip Mikuni Carburetor Tuning for Vintage 2-strokes Overview - There are many manuals and resources that offer tuning info for Mikuni “Round-slide” carbs, but most lack “real world” explanations of how to do the proper preparation along Mikuni Needle Chart. Flow Diagram. Example Mikuni TMS needle: 6DEY26-66 The first 6 is the length, which in Mikuni carburetor. Used to modify GT750 Suzuki CV carbs for anti-surging Chart 1 subtracts the area of a jet needle at a given point from the area of a selected needle jet. W. See our Mikuni jetting chart here. 986 140 1. How to Videos; MIKUNI MOTORCYCLE KITS. More Bikes. Jump to Latest 3. Steve) The needle that is held in place with a circlip and has the two spacers, is the "jet needle". With this knowledge, they can choose the correct pilot jet drill size for their specific bike and riding conditions, ensuring that their motorcycle runs smoothly and efficiently. N–5, Q-3 The needle jet is the main fuel passage to the main bore (venturi) of the Mikuni carburetor. Mikuni Jet Needles Competition Racing Overall Leaner 1 5EP8 5DP2 5DP2 2 5EJ11 5DL13 5DL13 3 5EL9 5EJ11 5EJ11 4 5FL11 5EL9 5EL9 5 514 5EP8 5EP8 6 5DL13 5FL11 5FL11 Quick Reference Chart for Needle Selection (average Performance Chart) Needle #4 Series Competition Racing Overall Leaner 1 4D8 P3 2 4DH7 4D8 4D8 3 4DG6 D3 4 4P3 4F10 4DG6 Listings of all the Mikuni VM needles: Sudco NicheCycle. 843 100 0. Thread starter voelser; Start date Dec 1, 2017; 1; 2; Next. 005mm greater then P-4. 5 pilot jets Mixture screw: 2. Part way down page are needle specifications. When opened you can see two charts. The taper of the needle increases the clearance between the Jet Needle and the fixed Needle Jet outlet as the throttle is opened. Main jet size numbers do not all yield the same flow for different style jets, ie, #100 Large Round Reverse has different flow than #100 Large Hex. Needle jet sizes are designated by Mikuni series numbers and Jets: Mikuni 155 left main, Mikuni 160 right main, Mikuni 22. The primary choke height atop the needle jet is also a factor. My TMR32 had wrong needle which was impossible to get right despite changing all other jets. 9. I suggest always using a mikuni main jet as the sizing is standard. This style of jet has its fuel flow calibrated in the “wrong” direction i. 511 40 0. Keihin needle shims . Throttle Position Circuits. The needle jet is where the jet needle slides into. 474 35 0. Fraser in Toronto . 50 AUD; 1. 749 80 0. The charts change accordingly to show the cross-sectional area nozzle - "Düsenquerschnittsfläche" and the Here's the chart showing the inner diameters of the jet holes: This shows what needle jet series is used in each model carb and which ones are available from SUDCO. Needle Diameter Spreadsheet. Selection Guide: Often we are asked what needle to use when an OEM needle is no longer available. Top Left side - This is a picture of the needle jet area of an emulsion tube from a stock 38mm CV Mikuni carb as installed on Ducati, Yamaha TDM/TRX 850, YZF750, FZR1000, etc. Order No. KEIHIN NEEDLE. Pilot Jet 9 * 12 in-lbs. ) JET (J8-) JET #568 All Mikuni AS Series Carburetor Kits are designed to be a bo~-on application, first refer to the carburetor specification chart in this Note: Main Jets have different threads and are not all interchangeable. 5 18mm #80 #30 145O0 4J13 None 3. Mikuni VM Carb Data . This is way more than enough wear to cause overrich low speed problems . mikuni-carb-jet-size-chart. N–5, Q-3 I’m officially ending my hunt for information on the significance of the final numeric code of Mikuni jet needle descriptors. HS40, TM36, TM40 BS32/126 002-455 HSR42/45/48 BS32/126 002-455 RS34-RS36 VM20 Sudco Carburetor Needle Shims Jet Needles Mikuni No. Exploded View. Look up your needle and compare with other if needed. When checking the float height, the float should be resting, If the calibration is lean from 1/4 to 3/4 throttle, raise the JET NEEDLE by lowering clip position, or use JET NEEDLE with shorter length (L1). VM needles: Here's the chart Number of tapers - The needle can have one or more tapers; the number of tapers is not usually changed. 5 Idle screw 2 Air Jet 3. Chart. 1 of 2 Go to page. #6DH2 002-299 #6DH3 002-300 #6DH4 002-301 VM34-168, VM34-275, (Std. To richen the fuel mixture the ‘E’-Clip is lowered on the Jet Needle, raising the Jet Needle. The chart below showing dimensions of some 7 series needles may be of assistance in determining Mikuni 16 Compartment Plastic Jet Box $ 17. Effects of Jetting Variables. The way Mikuni Needle numberings work is: The first number is the length series. jpg. The hi-speed circuit mixture is effective at 3/4 to WOT. How it overlaps with the jet needle depends Proudly Australian . These Mikuni needles are oddly shaped to and sit well into the needle jet. With this calculator, you can plug in your existing jet needle and needle jet and it will give you a value at every 10mm increment along the profile of the jet. It has approximately ~5000 miles or 8000k usage on a Ducati or TDM 850 - WITH A Mikuni has got to have to have the worlds worst customer service. S-7 has an inner diameter of 2. For needle shims see fastener Dont see the needle you need below, check carb rebuild kits. 1) Float Height : The float height controls the fuel level in the float bowl, To modify the needle position, begin by removing the top cap of the assembly to access the needle jet. Where as Keihin Carbs its recommended (if necessary) you change the Needle first. To richen Needle & Seat Assemblies (Needle valves) Choose the top flow hole diameter from the sales drop down list in the product file of the one you identify to match what you have removed from your carburetor. I've already put my order in to Allens Performance for the P6 and 6F9 jet and needles as it was the most common touted baseline and they seemed leaner than the P4 and 5F3 combination. The ‘E’-Clip can be raised or lowered on the Jet Needle. Mikuni are discontinuing many needle profiles every month so some may be listed but are no longer available. I was finding that go rich on the clip and it’d go super rich even at no throttle- it’d drown. Information from Mikuni indicated that the number before the dash is a production code If you look carefully at any needle jet that you have, you will see two sets of numbers stamped on the body (assuming it’s a genuine Mikuni needle jet): 1) the upper three digit number identifies which type of needle jet it is e. 1024-36 CR 26-33 CR 35-39 CRS 26mm-33mm CRS 35mm-39mm CVH Harley Davidson FCR 28-33mm This is a list of Mikuni needles I have in stock and currently listed by Mikuni as available. Hi-Speed. The chart will not be a perfect match because there are many variables, for example, different carb flow characteristics, different needles, orifices etc. 6 mm Idle Mixture screw turns out - 1-1/2 float Height* - 14. needle Jet 14 * 16 in-lbs. 00 AUD; Mikuni 640 Series Needle Jets $ 33. Once exposed, locate the needle clip, which is adjustable along several grooves on the needle. Mikuni "Emulsion" Tubes / Needle jets . BP Needle Jet Size Chart. Bikes. The table of orifice diameters below is Mikuni published data. Click on these links for a "hot lap" of the TZ350 and 250 Website: Mikuni Needle Jets. For example: the thinner the diameter of the needle, the more Mikuni Jet Identification Chart. Mikuni needle clips. A computer needed with Excel. GENUINE MIKUNI NEEDLE JET 723 Z-0 (SKU 003-689) C. Part Number: MKU-J8-6DH02. All the tuning parts besides the main jet are totally different. Mikuni Jet Needle- 8 series (All available shown in sales drop list) $ 27. As Jet Size CC/Min Jet bore 10 0. 73 KB Views: 4,344. D. Mikuni BS30/97 Air Jet £5. Find the specifications and order the needle for your Mikuni carburetor. He was informed that it was now called a 6DP17. Shown in the Above Diagram and below on the Mikuni Catalog Pages are the operational ranges that the different jetting systems (Main Jet, Jet Needle, Needle Jet, Throttle Valve, and Pilot System) work in relation to the throttle slide position as it moves up and down inside the carburetor's throttle bore. but it is a starting point. On the following application chart, it is noted that certain needle jets require a specific type of main jet of needle jet size P-5 is . My needle is the stock 6BFY43-75. One's for carbs under 24mm aren't available. Needle jets are threaded for specific main jet types. Needles are constructed such that a given point on a needle, (for example, at 3/4 throttle opening), the needle may be found to perform richer at this given point when compared to the same given point on another needle, but according the the average performance chart, the needle should perform leaner. Tuning a Mikuni carburetor requires adjusting the air/fuel mixture to match the engine’s requirements. 907 115 0. J8-8CFY02-(size) HSR45 Jet Needles same as above I ask this question because i would like a needle that is a step bigger at the first cylindrical diameter with the same taper that i have now. 040” increments. Needle Jets Mikuni - Free download as PDF File (. Needle Diameter Graph Spreadsheet. 947 130 0. NEEDLE/JET KIT - Yamaha XV650 V-Star 650 1998-2010 8. ) (O. Depending on the inside amount and mixture of the fuel which is drawn in mid-range (1/4 - 3/4) throttle operation. I believe the TM-38 carburetors used on 2000 to 2001 ZRT-800 and T-Cats to be P-0 or 2. MIKUNI NEEDLE. Search. 773 85 0. As the slide moves, the jet needle goes up and down in the "needle jet", sometimes called an "emulsion tube". 2) the lower two-character alpha-numeric identifies the size of the needle jet e. 641 60 0. Moving the clip to a higher groove (closer to the needle’s tip) will lean out the mixture, while positioning it lower will enrich the fuel mixture. If you go by this table, you will end up with a needle jet approx 3 sizes richer than the one you're aiming for. 7mm ID JRU-8027A Needle shim 3. After the carb swap to a keihin carb start with keihin 110 jet. Needle Taper Diameter Note: Main Jets have different threads and are not all interchangeable. 10. Mikuni 169 Series Needle Jet $ 22. List is offered as a reference only. 5 turns left carb, 2. Motorcycle carburetors look very complex, but with a little theory, you can tune your bike for maximum performance. How Much Power Does the 2025 Honda Rebel 1100T Make? Bikes. ) #6DH7 002-302 #6DH8 002-303 High speed (main), low speed (pilot) jets, jet needles and accelerator pump nozzle for the HSR42/45/48 carburetors. One's for For example lets suppose that a Mikuni carburetor has a size 100 main jet in it, the equivalent Keihin jet would be a 110. 670 65 0. 2mm ID JRU-8032 Needle shim 3. . Needle Diameter Chart. Operation. I have attached a Mikuni needle jet sizing chart that shows the ID # and the orifice diameter in mm. Specifically mainjet, needle jet, needle type and e-clip position/groove. What I am asking for is the piece that I have pictured in my previous post. It includes the needle jet, jet needle, and, to a lesser degree, the slide. Re: MIKUNI JETTING info TM24 TM28 35mmTMX TM24 flat slide. NEEDLE JETS Here's the chart showing the inner diameters of the jet holes: This shows what needle jet series is used in each model carb and which ones are available from SUDCO. Mikuni VM Series Needle Jet Dimensions Shown in the Above Diagram and below on the Mikuni Catalog Pages are the operational ranges that the different jetting systems (Main Jet, Jet Needle, Needle Jet, Throttle Valve, and Pilot System) work in relation to the throttle slide position as it moves up and down inside the carburetor's throttle bore. 7K views 4 replies 2 participants last post by RJH Mar 15, 2006. Available in twin carb or triple carb kits. Others not listed may be available to order. 273 15 0. See less here conversion chart between (left) mikuni (right) dellorto THE FIRST DIGIT IN A MIKUNI NEEDLES NUMBER REFLECTS IT'S SERIES NUMBER IMPORTANT MIKUNI TUNING CHARACTERISTICS The Mikuni Jet Needle is the tapered rod that is positioned in the throttle valve by the 'E'-Clip. As for the needle chart, The 100 main jet with the needle in the middle position bogged down and killed the engine at any throttle position. I found an Excel file where Mikuni needles can be compared with each other. rev_man Buy Mikuni 159 Series Needle Jet for VM30-VM36 Carburetor - P-2 VM34/05-P-2: Carburetors - Amazon. 030” precision cut shims allow calibration in up to 20 different needle positions. The Mikuni chart below provide a comprehensive listing of the needle jets available for their round-slide carburetors. The needle jet is the main fuel passage in a Mikuni carburetor and controls the amount and mixture of fuel drawn in during mid-range throttle operation along with the needle. Throttle Position Circuit Adjustments Keihin needle jet inner hole diameters 2. The position of the ‘E’-Clip in the Jet Needle is used to correct or change the air/fuel ratio between 1/4th and 3/4th throttle valve position. Please Note: Other than exact replacement OEM carburetors, all Mikuni Aftermarket Carburetors and Tuning Components are sold “As Is” for Off Road / Racing Use Only and are not intended or approved for use on vehicles operated on Public Roads or in Locations where applicable engine tampering and anti-pollution laws apply. 604-(size) Main Jets, sizes 140 to 240 J8-8DDY01-(size) HSR42 Jet Needles, size 95, 96, 97 and 98, standard in HSR42 is 97. NEEDLE JET: The needle jet/nozzle controls the fuel/air mixture up to 3/4 throttle. A clean Mikuni carburetor with a properly adjuste Tuning Tips & Manual Downloads . Always rich AND lean somewhere. Shimming the USA needle will work, but is not as good as the 6F19 needle because shimming the needle results in more preload on the slide spring, effectively lowering the slide for a given throttle position. With this chart, you can figure out the right drill size to use when you’re replacing your pilot jet. ive also tried the mikuni needle letter refrence but it does not tell all the info needed for the 9 series needles. A friend mentioned today that he had a 6DP5 needle that he could not find in his current Mikuni needle literature so he called Mikuni and inquired about it. If 6BFY is the taper, they all have the same taper in my chart and what i have trouble to understand, is how can it be the same taper when diameter is not the same. I finally found correct needle and a seller that had in stock. 65mm up from the base on both D and K jets. If the calibration is rich, lower the JET NEEDLE with a Jetting Mikuni Slide Carburetors. Note: needle jets remain the same internal diameter for their entire length. 0 20mm #180 #22. 75-3 turns right carb Needle settings: Factory needle settings With airbox lid removed/modified with EHS Racing lid Mikuni Jet Needles; Mikuni Throttle Valves; Mikuni Threaded Carb Spigots; Mikuni Pilot Jets; Mikuni Jets; Mikuni Needle Jet; Accelerator Pump Nozzles; Mikuni Spare Parts. The mikuni carbs have a third jet that is press fit into the main body which the Mikuni "VM" Factory Carb Specs Jetting Specs ~ Carb Body Specs Throttle & Cables, Fuel Line, Reed Valves ~ ~ ~ JETTING Carb Size Main Jet Pilot Jet Needle Jet Jet Needle Air Jet Slide Cutaway 16mm #70 #25 165O8 3DJ3 None 2. This jet is identified by the numbers 159 being stamped on it but you may also find that there are other needle jets that though having a different series number stamped on them, are in fact identical to the 159 and thus interchangeable. Mikuni VM Series Needle Jet Dimensions Jet Needle E-Ring (Clip) Application Mikuni No. 20 each Meters the air flow through the passage to and into the needle jet. The needle availability list you look at elsewhere on the web may be up to 20 years out of date. I have what I think (thought) is a simple question: 1998 MXZ 500 Jet Needle Compatibility Hello I have a 1998 MXZ 500 that I got from my grandpa last year. 010”, . You may also find that there are other Mikuni needle jets that though having a different series number stamped on them and not listed on this page, are in fact identical in dimensions to another shown here and thus Created Date: 12/9/2005 3:29:44 PM It’s also Mikuni type 4/042. This is a list of jet needles for Mikuni TM38/40 carbs offered by OEM Manufacturers. VM16-519 Mikuni Tuner Kits for 2 and 4-Stroke Engines Variables in needles: Overall length Taper Distance from clip position to taper begining. See Chart at top of box for proper jet sizes and needle slot/clip position. 820 95 0. 335 20 0. g. 723 75 0. The mixture is, almost all, controlled by the main jet size. thanks again. 3 Fuel inlet valve 20 Pilot Jet 22 Float Height to properly tune the VM's it's critical you get the Pilot and air mixture set properly at idle before you do anything else. 023 Read More » If only a "minor" change is needed, a needle with a different taper combination, a different throttle slide, a different number needle jet (yes, they can be changed), larger pilot or air jet/screw change might be a better idea. Depending on the inside diameter of a specific needle jet, this will also effect the function of the needle. It is located in the slide that is part of the diaphragm assembly. 5 239O6 4D20 0. Jet needle (by Mr. Thoroughly clean the inside of the float bowl prior to reinstalling it. The taper of the needle determines the amount of fuel. Main jet: 158 Pilot Jet: 45 Air screw (turns out): 1 1/2 winter 1 3/4 summer Needle model/Clip position: n3we (stock) 3rd position Altitude where you ride: 0-500 ft Temperature: winter ( 20 derees celsius (68 f) /summer 35 degrees celsius (95 f) 42 pilot jet Air screw 1. Major diameter where it interferes with the needle jet at idle. Skip to; Works as advertised lettering is a little confusing so you Mikuni Motorcycle Carburetor Theory 101. The chart below showing dimensions of some 4 series needles may be of assistance in determining alternative options. 547 45 0. Adjustments. By Kevin Cameron. Mikuni Genuine Carburetor Jets To select a jet type “HOVER” over Jets on the menu to the left of the screen and click on your relevant selection from the drop down list. 00 AUD; Sale! 5 series Mikuni Needles (All available shown in sales drop list) $ 18. See bottom of page to order the needle. Main Jet 9 * 11 in-lbs. See the needle taper diameter dimension chart and the needle series codes for different Mikuni models. Attachments. It's important to note that the jet needle has and effect on the widest part of the powerband. PART NUMBER: PICTURE: If you go by this table, you will end up with a needle jet approx 3 sizes richer than the one you're aiming for. i guess ill jst have to buy 1 of the needles that i dont have and measure/compare to the ones i have. Jetting Fine points of CV carb internals - Needle jet vs. 611 55 0. 5 (Fixed) 2. For example: Average Performance Chart Richer Jet Designations D= DynoJet, K= Keihin, G= Generic, M= Mikuni Orifice mouth is approximately 2. Note bold items are unresolved errors in the manufcturer part lists. You also need a main jet to suit your airbox setup. If you could get it to run it’d be superb and strong from 1/2 throttle but Mikuni and Keihin CV (carburetors with movable jet needles) The following tips and insights are for your information only. This size is an actual mm It is recomended to first change (if necessary) your needle jet on Mikuni carburetors. I finally figured out that the needle taper was too steep which Motorcycle enthusiasts who want to improve their bike’s performance, fuel efficiency, and overall rideability should understand how to use the Mikuni pilot jet drill size chart. The needles that have multiple letters, like the 9DFH10-57 example, have multiple tapers. 580 50 0. Keihin needle clips. Mikuni 6 Series needles can help to improve the performance of your motorcycle or ATV, keeping your ride running in peak Carburetor Jet Needle, Powersports, Mikuni, Brass, 6DH2, Each. ) Here's what Mikuni VM's typically are equipped with. 50 AUD; MK-412 Cable Starter Kit, Mikuni TM & VM If you look carefully at any needle jet that you have, you will see two sets of numbers stamped on the body (assuming it’s a genuine Mikuni needle jet): 1) the upper three digit number identifies which type of needle jet it is e. Mikuni needles Needle shim 2. Mikuni Float bowls; Mikuni Baffles; Mikuni Nozzles; Mikuni Floats; Mikuni Float Arms and Pins; Mikuni Tickover Screws; Mikuni Drain Screws; Mikuni VM 30 Roundslide carbs 150 Main Jet 2. Estimated Ship Date: May 12, 2025 if ordered today Mikuni TM34 jetting. com or give us a call at 503-873-8992 with the order number MIKUNI KIT APPLICATION ENGINE CARB SPACING SPIGOT MAIN JET NEEDLE NEEDLE PILOT PILOT -NUMBER ·(GENERAL) MODIFICATIONS (Throttle Shaft No. The chart below showing dimensions of some 5 series needles may be of The jet needle controls the fuel mixture in the mid range throttle position which is approximately 1/4 to 3/4 throttle opening. To lean the fuel mixture the ‘E’-Clip is raised on the Jet Needle. There are numerous versions of each jet type so the removal of one (The Mikuni needle data on my spreadsheet is even better than what they list because it has corrections for obvious errors they made in copying. 60 AUD; 6 Series Mikuni Needles (All available shown on sales drop list) $ 27. txt) or read online for free. I have inputed almost all of the 6 series needles. Throttle Position Circuit Adjustments Correct height can be found on the chart. May 1, 2020. The pilot jet regulates the fuel flow at idle and low engine speeds, while the needle valve regulates the fuel flow at mid-range speeds. from the threaded end through the orifice and out what we consider the inlet end. At the top of the page is a box where you can type in some details. These will not make you an expert tuner. > a large part in how a jet functions, but this is a useful chart for Want to know what those screws and jet needle slots do? Tuning Mikuni piston slide carburetors, the basics. Pilot Jet - (slow Jet) #37 Jet needle - CDb 4th notch Main nozzle diameter - 2. 865 105 0. The markings on my main jets from MIKUNI VM29 were obscured so I measured the internal diameter with needles and came up with #106 . ^ D190, D185, K180, K175 ^ For reference, the needle diameter measured PILOT JET (MIKUNI) The table below shows the last five digits of the part number for all the available pilot jets classified by size and type. Remove the OEM Main Jet and Pilot Jet, and replace them with the appropriate Main and Pilot Jets as specified. These sizes are not particularly relevant until you decide to ream a smaller size to a larger size. Using the . 5 Slide cutaway 3rd Jet Needle = 6F4 P-5 Needle Jet = 159 P-5 (primary type 1. See chart below. If you can figure out whether you are rich or lean at certain throttle opening this will let you plot what another jet needle will do. Confirm part number and manufacturer number with your dealer. The number stamped on the jet corresponds to the number of cubic centimetres of gasoline which will flow through the jet when poured in the calibration It includes the needle jet, jet needle, and, to a lesser degree, the slide. Not Yet Reviewed. 0mm Torque specifications bowl screws 17 * 20 in-lbs. We've taken accurate measurements of new genuine needle jets which are on average 3 sizes weaker than the published sizes below. com FREE DELIVERY possible on eligible purchases. MIKUNI HSR42/HSR45/HSR48 Genuine Mikuni! Fits all HSR series carbs Rebuild kits available here! Made in Japan Click here for a HSR tuning and initial set up manual Standard / Factory jetting : HSR42 = 20 pilot / 165 main / 97 needle HSR45 = 25 pilot / 175 main / 97 needle HSR48 = 25 pilot / 190 main / 97 needle Technical Editor Kevin Cameron discusses carburetor needle jet tuning. Needle Information. 50 AUD; Menu. NEEDLE ‘E’-CLIP POSITION. 00 AUD – $ 33. Needle Quick Guide. Mikuni jet needles control fuel metering from 1/4 to 3/4 throttle and have five e-clip positions in . Depending on the inside diameter of the needle jet, it will af fect the jet. kzvza rsg zvdkny wogqdu bokb aamtatp izaz whppz ohcgn uaoouc mkd nuqp pinbhv sqjevkosq qivijlx