Keihin Jets Size Chart







If the engine shows performance problems such as stalling or sluggish acceleration, you'll need to change the jet sizing. com - Your Keihin-Mikuni …. Carburetor Size Calculator This is a simple calculator for determining the approximate size of a carburetor. with the Kehin style jetting you just richen the main jet until you get the bog, and then back off a size. Mikuni / Hitachi / Keihin "Emulsion" Tubes. Perfect for tuning carbs to extract peak performance. Following in their tradition of high technology and perform-ance, Keihin's latest carburetor design for racing is the FCR. The factory pilot jets are always #42. However, Mikuni American does maintain an inventory while they last of Replacement Parts, Rebuild Kits and Jet Tuning Components for the Mikuni PHH Carburetors. The carburetor consists of following parts: pilot jet. You can see that elevation falls in the light gray band for “first smaller jet. Yost offers a complete kit for the Keihin CV carb that includes the Power Tube, fuel jets, slide needles, needle shim washers, drills for enlarging the slide's vacuum hole, and a different-rate slide spring. Keep in mind that you will spend much less time tuning the carburetion in following order: 1. Includes the the following sizes 50, 53, 57, and 59. The following chart lists all Mikuni main and pilot jets and the part number of each that are presently available. 5 98 Keihin/Dynojet/Mikuni Conversion chart. Notes: The 1999 Yamaha YZ250 used a PWM38 Keihin carb with a power jet (previous YZ250s did not have power jets). if you were looking for a different size Main Jet than Standard for your bike I would recommend taking a look at the carburetor diagram for your bike in our OEM parts finder and there should be a few options listed for the main jets. The RPM entered should be the maximum RPM the engine is to run (you know that RED LINE on your tachometer). 5 racing carburetor for sale, Assemblies: - TPS (throttle position sensor) - Cold start choke - Hot start choke - Oversize bowl drain plug - Fuel mixture screw remote control - Silicone vent lines + filter case with oiled filter insert - Velocity stack neck size ø 63. A JD Jetting Kit is included, for you to install, that includes needles, jets and a tuning chart for elevations from sea level to 12,000 feet. Many will look at jetting charts and infer from it the jet which is affecting carburetor circuit. The pilot jet is the one that controls low RPMs such as idle. my aftermarket needle is set on the 4th notch up with 2 washers on top of that. List of part numbers that are compatible with the Kimpex number :. Keihin PWK carburetors is the dominant carb on the factory motocross machines. K23 needle (clip in middle position, top = leaner) main = 150. Please make sure you have ordered the correct type and. Part: Honda CL350 / CB350 Carburetor Rebuild Kit Why You Need This: So that guy you just bought the motorcycle from says it just needs the carbs cleaned. Using the CarbJetKits Jet Kit calculator is the only way to reach optimal performance. I made a webpage detailing where these adjustments are. If your bike is in fairly standard trim start from the factory settings as found below. Read this carefully 3 times. You should quote: jet type ie. I didn't come up with the chart. They did not make a DC3, DC5, DC8, DC9, or DC11. 35mm in diameter. Switch from the standard D7E (NGK) or X22E (ND) sparkplugs to the D8E (X24E) at this same time. Yost offers a complete kit for the Keihin CV carb that includes the Power Tube, fuel jets, slide needles, needle shim washers, drills for enlarging the slide's vacuum hole, and a different-rate slide spring. All EBC Keihin Pilot Jet Kit $ 43. Mixture, Jetting adjustments and how the carburetor works explained! Time stamps to each adjustment in the description. Here we focus on the 50cc moped and scooter carburetors from the 1970’s and 1980’s. Further reading about carburetor jetting and. and the exact position of the hole in the jet length. 032 etc etc. 80 Overall Length: 8mm Please select jet size from the drop down menuMade in Taiwan. If your stock main jet is a 100 (stock size in a 22mm Mikuni) you will find this jet size falls between the #62 & #60 drill bit. Keihin Jets are sized in steps of 2 and 3. The fuel pumps on these carbs produce more than double the fuel pressure of the earlier "round pump" designs. Dinqua's Jetting Calculator. Keihin carburetors are used on almost all Honda motorcycles (or copies of Hondas). We distribute goods daily to motorcycle retail stores throughout WA. 2mm with 1 x 1. The factory jet size on the CB360's is a 110 - the CL360 & CJ360 can vary as well. oo slow jet - - 18-99305: keihin 76-89. I’ve tried everything to make this carb work, including Holley Tech Support, changing cam position, diaphragm, Squirters, jets, etc. Find the lowest prices on all DG Performance products, and get free shipping on JavaScript seems to be disabled in your browser. Take a look at the chart above to see what an HSR carburetor can do for your bike. 9 = sea level jet size. Read this carefully 3 times. Jet chart click image for larger version name carb circuits jpg views 16626 size 19 6 fig 7 click image for larger version name temp altitude correction jpg views 6653 size 95 3. Apparently, there are two different sizes of main jets for a Harley Keihin carb. If the engine shows performance problems such as stalling or sluggish acceleration, you'll need to change the jet sizing. Looking at the float bowls, it appears that the overflow tube in the left bowl has been cut shorter. Jack’s has several different ways to help you find the replacement Honda Small Engine Carburetor parts you need. It's straight from Keihin. jetting range effectiveness chart. Change main jet to two sizes larger with N428-48 series for N85 series. location at that time. We stock most replacement parts for the Keihin CV (Constant Vacuum) carburetor, including the rubber membrane for the throttle slide and a screw to adjust the air/fuel mixture, parts that even Harley-Davidson does not supply. A Puch carb might be a 14mm Bing with a 64 jet, while another Puch carb might be a 12mm Bing with a #60 jet. 5 Dynojet on the outside and 127. If possible pick a stretch of highway that will run you 2 to 3 minutes such as between exits where you will be able to maintain a consistent highway speed (65-70mph). The RPM entered should be the maximum RPM the engine is to run (you know that RED LINE on your tachometer). If you like to see your Bike listed below, Request it here. This is the range that is too lean for best engine performance on stock motorcycles. If you are performance minded, then this information is for you. The colour of the insulator is influenced by the jetting and the heat range of the sparkplug. This accounts for the difficulty many have with Keihin idle circuits by the way, in terms of their being so ridiculously small as to be much harder to get clean. Most of the new pwcs are coming from the factory with different size high and low speed jetting for different cylinders. Mixture, Jetting adjustments and how the carburetor works explained! Time stamps to each adjustment in the description. I have a plugged #40 slow jet on my '73CB500. SUZUKI RM125 JETTING RECOMMENDATIONS Kits may include jets, needles and any necessary hardware and have been developed with the assistance of Dynojet. MIKUNI MAIN JETS EXPLAINED or HOW I SAVED BIG BUCKS JUST BY LEARNING THIS STUFF OK folks, here's the full meal deal on Mikuni main jets. Mikuni Vs Keihin jetting comparison Trying to convert the LT over to a keihin carb and I'm curious if there is a way to tell what is equivalant to the mikuni jet but in Keihin sizes. 032 etc etc. You will find the current jet number stamped on the top of the jet. Each metering orifice is identical - jet to jet! Factory Keihin Main Jets are designed to be direct replacements for Genuine Keihin jets. ive spent a few hours now lookin on the web for a chart for this but everyone i did find was just slightly different in there number systemi just got a keihin 28mm carb that i bumped up 2mm larger to 30the main jet from the keihin has a 150 in it and u can see that its a bigger diameter than the mikuni that has a 230 stockis there a formula for figuring this out?? thanks guys. Kit includes one of each jet size listed. 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. Read this carefully 3 times. 0 Air Jet, 159 P-5 needle jet *Sold as a single carburetor, for a complete dual carb setup be sure to order two carburetors, two choke plungers (if you prefer that style) and a Mikuni universal throttle cable. However, Mikuni American does maintain an inventory while they last of Replacement Parts, Rebuild Kits and Jet Tuning Components for the Mikuni PHH Carburetors. 60 mm (#60). Since it covers the same range as the main jet, it is often ignored, and in very many cases it is removed all together. Keihin Carb Jet Size Chart • this is images about keihin carb jet size chart posted by Brenda Botha in Keihin category. Accelerator Pump Leak Jets and PowerPump Adjustment-Watch the following video to see the effects of the PowerPump adjustment screw. These adjustments can be made in finite increments as small as a 1/4 jet size at a time. 9, the one that you are working on may be slightly different but the principles shown will apply to all of the models indicated. 58 Pilot Jet for HD Keihin Butterfly Style Carbs - 22739. The midrange is checked by speeding the engine up to about 1/2 throttle. I’m wanting to upgrade the stock carb but not sure which jet sizes to use. And again, plug color is the final indication of mixture. She had been kinda lugging on acceleration and while starting, the right side cylinder wanted to burp, fart, and sputter for a few minutes until it got wam. This is the range that is too lean for best engine performance on stock motorcycles. The numbered drills come in sizes that don't match the jet hole sizes. If these vapor pressures are not disposed of, then the pressure inside the bowl pushing down on top of the level of the fuel will be greater than the calibration of the carburetor intended it to be. Just to keep it entertaining I guess. We have the best prices on dirt bike, atv and motorcycle parts, apparel and accessories and offer excellent customer service. Carburetor jet available Slot Head Style (Needle) or Hex Head Style (Main). Since the pilot/slow jet is supplying fuel at wide open throttle we always recomend starting with the slow/pilot jet. Chemicals Intake Control Suspension Engine Electrical Vintage. Rnd of unknown origin I think but am unsure if the small round is stock in Keihin/Deni on these buggies. '77 keihin carb jet sizes? hey guys, i am redoing the carbs on my '77 ironhead. Most of the new pwcs are coming from the factory with different size high and low speed jetting for different cylinders. High Quality, Made in Taiwan! Specs. I have look for a chart but I cant seem to find one that goes high enough. K23 needle (clip in middle position, top = leaner) main = 150. how to: adjust your keihin fcr leak set, r&d racing gives tutelage for key power gains Share Facebook Twitter Google+ ReddIt WhatsApp Pinterest Email The modern high performance four-stroke engine is, for the most part, strapped with using carburetors, albeit the incredible Keihin FCR unit, which until now has played a dominant role in the. we have a huge selection of different size jets for your keihin cr, fcr, pj, pwk & pwm (99101-357) carburetors. Eg: 100,102,105,108,110. If you are curious as to the comparison of jet sizes between different brands of carb jets, the chart below should give some guidance. In this video I will show you how to jet your 2 stroke carburetor, explain the basics of Jets, Needles and Airscrews. Keihin 105 is the stock. The Keihin CV (constant velocity) carburetor's idle and just off-idle air / fuel mixture is controlled by the pilot jet which is fine-tuned with idle mixture screw. com and we will send you an Invoice or call 503-873-8992 and we will Help you. Main Air Jet: #110: Jet Needle: Carb 1 and 4 = N7SB: Carb 2 and 3 = N7SA: Needle Jet: 2. Note: Main jets supplied by CVP are sized to original OE specifications from H-D and Keihin. Keihin High Speed Jet - Size 132. 5, needle jet type 159, needle jet size P-2, P-4, needle 6DH2, 3, or 4, Main 220-230, air jet 1. This will result in a rich mixture due to excessive fuel being forced through the jets into the carburetor and on into the intake manifold. Five Carburetor Keihin & Mikuni & APT… JDJetting Carburetor Parts -Picture Gallery ; JDJetting Fuel Screw and Drain Caps Gallery KTM 450 and 530 - Jet Kit. Set the screw at 1 ½ turns out and consult a professional for further assistance. List of part numbers that are compatible with the Kimpex number :. 6mm Replacement 1993 Kawasaki 750 SS Keihin Needle & Seat 1. On a 650/750 Twin (Triumph &/or Norton) for a PAIR of Mikuni VM's 32mm dia, use pilot 20-25, throttle slide 2. **Mikuni specific intake boot sold separately. 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. 18-99300 - Keihin Carb Complete Jet Assortment. take the size jet you want and divide by. My ACCS on my 2000 RMK 700 is finally going out (yeah it lasted this long). Floats are available for some Keihin Carburetors: Keihin Needle Jets. You see, the main jet size is not controlled by emission testing and the government is not very interested in mixtures at full throttle. Sudco International carries a complete tuning range of optional jetting for all Mikuni and Keihin Carburetors. 5 mikuni jet in it, which flows the same as a 108 keihin. Below you can find the refference size charts for different brands, please find out your correct size before ordering. Once the engine has cooled down remove the spark plug and check the color of the electrode. Dedicated to your questions and opinions on Banshee exhaust and jetting. On the elevation scale at the bottom of the chart, select 7,200 feet (between 7 and 8 on the scale). This chart is under construction and verification and we are not responsible if some data is wrong. SUDCO GATALOG 2010. Main Air Jet: #110: Jet Needle: Carb 1 and 4 = N7SB: Carb 2 and 3 = N7SA: Needle Jet: 2. Part: Honda CL350 / CB350 Carburetor Rebuild Kit Why You Need This: So that guy you just bought the motorcycle from says it just needs the carbs cleaned. Further reading about carburetor jetting and. with the Kehin style jetting you just richen the main jet until you get the bog, and then back off a size. Looking at the float bowls, it appears that the overflow tube in the left bowl has been cut shorter. 5 from the states and it worked better. This chart will work for 1988 to 2001 KDXs equipped with a Keihin PWK Carburetor. I ask because years ago when I called Sudco and spoke to someone he claimed that the best way to jet a carb when more fuel was desired was to simply drill it out until you are satisfied with the jetting. Mikuni Vs Keihin jetting comparison Trying to convert the LT over to a keihin carb and I'm curious if there is a way to tell what is equivalant to the mikuni jet but in Keihin sizes. The same goes for the jets; I prefer OEM Keihin jets, available from Honda dealers or JetsRUs. The result is that Mikuni's sizes are vastly different from the other makers'. The jets that come with the kit are not large enough. I am trying to replace my stock main jet. As a rule of thumb, go up one jet size, and if you lose power, down-jet by two jet sizes. If you are running a stock Hobbit, then changing your jets may not be necessary. You can see that elevation falls in the light gray band for “first smaller jet. Those Honda numbers you posted are a multiple taper needle that won't translate to the standard Keihin chart needles. Here we focus on the 50cc moped and scooter carburetors from the 1970’s and 1980’s. I am awaiting a minor part & thought i would post this. When comparing the two brands of jets a Dynojet the same number as the stock Keihin 148 would be 6 sizes larger. Part Number 78-113 is used with R2 Carburetor. The KLR650's CVK40 carburetor has a Keihin 148 main jet from the factory. The stock jets for the RMK from the factory are a 185 PTO and 190 MAG main and a 48 pilot. Keihin jets have been very close to actual size from my experience. Browse our selection of Jackets for men, women, and kids at NHLShop. 9 = sea level jet size. keihin slow air jet, motorcycle main jet, main jet. Currently available Bike's with Jet Kit Calculator: Honda CMX250C Rebel 1985; Honda CMX250C CD Rebel 1986-1987. From Keihin, I selected the CV51 which is the biggest available from them. its strange. Keihin Part No/Size Dimensions 99101-357-SIZE: 6mm Hex head CR Special, all FCR’s, FCR-MX, PE, PJ, PWK, PWM. 50 each Meters the air flow through the passage to and into the needle jet. •Ural Changed to Keihin Seiki L22AA for US Imports in 2000 See Chart 35. For maximum engine protection, we recommend DP or K&N Air Filters To help dial in your new carburetors for your specific engine requirements, we also recommend purchasing one size larger and one size smaller main jet sets. Experienced tuners know that proper design and multi-step inspection processes are necessary to produce the highest quality carburetor jets. JD JETTING KEIHIN 38MM PWK SHORT BODY CARB FOR 2017-2019 KTM 250/300 SX/XC/XCW AND 2017-19 HUSQVARNA TE/TX250/300 2-STROKE Short Body AIRSTRIKER CARBURETOR WITH JET KIT. Needle Jets controls the fuel mixture from 15% to 60% open throttle. With its new features the PWK will continue to be the first choice in per-formance carbs for your 125, 250, Enduro or ATV. All parts needed for complete rebuild (except needle valve), Fits either 38 or 44/46mm Super BN and High Performance BN carbs, four-screw pump covers. (I see the big differences in Mikuni hex and small round on yer chart) The jet in the K/D is definately Sm. Keihin Jet #'s are a NOMIMAL size,,,,just a "name",,,not an actual dimension. Supported Models. size#, to the exact. If the airscrew adjustment process is unsuccessful and leaves you confused. MAIN JET 1. The jets on a carburetor meter the amount of fuel that enters the throttle bores of the carburetor where it mixes with incoming air. I’ve tried everything to make this carb work, including Holley Tech Support, changing cam position, diaphragm, Squirters, jets, etc. The main jet is now beginning its operation but fuel is metered through the main jet by the jet needle's profile and position within the slide (or valve) this is known as the "clip position" referring to the retaining clip on the needle. Since the pilot/slow jet is supplying fuel at wide open throttle we always recomend starting with the slow/pilot jet. 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. Free shipping and Easy returns. Type 99101-393. Others are upset by a backfiring, or smoke belching monster. 6mm Replacement 1993 Kawasaki 750 SS Keihin Needle & Seat 1. Otherwise you can burn holes in the pistons. The BS38 pilot jet seats inside the float bowl. Starter Jet for Keihin FCR-MX, Main Air Jet for FCR’s. DJ Style Main Jet. Drill bits sizes that approximate mikuni jet sizes. Should I rejet or try to find a stock air cleaner setup and see if that fixes the problem. Below are all different types of main jets that are typically found in Mikuni or Keihin carbs. Aftermarket jets just aren't manufactured to the same tolerances and can vary quite a bit from OEM specs. The diaphragm look to be in good shape. You can also find other images like main jet size chart,metric plumbing chart,s&s jet size chart,basic metric conversion chart,decimal chart,holley list number chart,relativity size chart,drill bit conversion chart,carb jet size chart,mikuni carb tuning chart,pilot jet size. com which seems to match these charts but includes an extra column of information. This is what causes the visible rich condition, and confirms the need to increase the jet size. I also show the relationship of all the inner workings of your carburetor to. We've built hundreds of pumps now with anti-seize and it works great!. The jets that come with the kit are not large enough. Shindy Carb Repair Kit 03-720 86030 $29 1a Heavy-duty compressed paper gasket 3b Needle marked D629 31,32 The pilot (42) and main (102) jets are marked with their sizes. DJ marks jets by diameter, and everyone else marks them by flow. Now I'm starting to worry slightly - I run 132. We tested a highly modified Buell S1 ( 1250 Kit, Sledge Hammer Head Porting , IMPACT 560 cams ) with both the stock CV40 and an HSR45, with no other changes between the two pulls. Jet Kit Calculator Techincal How does the CarbJetKit jet Kit Calculator work? The Calculator is the only existing tool to determine what Jet Kit is needed for your Motorcycle considering altitude, ambient temperature and applied intake and or exhaust modifications. Here's some pics of the YZF-R6 carbs (49-state) that I took while installing my Ivan's jet kit. The way a jet is made changes the amount of flow it is capable of as well. The first thing we do is match the stock main jet to its corresponding numbered drill bit. They don`t come in different sizes for a specific model as they`re adjustable. Keihin replace main jet with next richer until the BEWAH bog just barely goes away, then replace the main jet with the next richer and run it. James Dean's Keihin Jetting Guide is an amazing Excel spreadsheet for PWK (and FCR Four Stroke) carbies. Meaning, a jet from one manufacturer that is tapered or chamfered in a different manner could flow more or less than another manufacturer's jet of the same diameter. It matches the other conversion with the Stock jet mft (Keihin) added Keihin* Dynojet* Mikuni 92 92 85 95 94 87. Jet-Tech PWK Fine Tuning Part 1, this video detailed the fine tuning process of Jet-Tech PWK for the Keihin Carb used for the Honda Stock/Super Moto package. For Denver: Take 0. Below are all different types of main jets that are typically found in Mikuni or Keihin carbs. This is only a starting point, but very close. Most tool companies will be able to supply specific drills for jets. Keihin Carb Jet Size Chart • this is images about keihin carb jet size chart posted by Brenda Botha in Keihin category. The pilot jet meters. Set the screw at 1 ½ turns out and consult a professional for further assistance. KTM 250/300 XC/XCW/SX. PILOT JET: The pilot jet is a medium size (¾-1") brass jet located inside the float bowl next to the needle jet/main jet location. Both the pilot jet size and the idle mixture screw setting are important for a proper idle. Needle Dimensions. 80 Overall Length: 8mm Please select jet size from the drop down menuMade in Taiwan. Shop for Fuel and Air Intake Systems, like Pro X N424-21 Series Keihin Pilot Jet at Rocky Mountain ATV/MC. 70 slow jet - - 18-99309: keihin 76-89. Jet for the 20mm Keihin. Both main and power jet should add together to a normal main jet size. Jet Kit Calculator Techincal How does the CarbJetKit jet Kit Calculator work? The Calculator is the only existing tool to determine what Jet Kit is needed for your Motorcycle considering altitude, ambient temperature and applied intake and or exhaust modifications. 5 again and get good idle on 2 counterclockwise screw. (and original Honda 18/20mm Keihin's) and includes the following. The larger the orifice the more potential fuel flow. 50 NOTE: Drill 2mm Hole in each Throttle Valve for Single Carb setup. This is why it is important to know what jets your carb came with, and to start out with those jets. JD JETTING KEIHIN 38MM PWK SHORT BODY CARB FOR 2017-2019 KTM 250/300 SX/XC/XCW AND 2017-19 HUSQVARNA TE/TX250/300 2-STROKE Short Body AIRSTRIKER CARBURETOR WITH JET KIT. We tested a highly modified Buell S1 ( 1250 Kit, Sledge Hammer Head Porting , IMPACT 560 cams ) with both the stock CV40 and an HSR45, with no other changes between the two pulls. Best top end with a wide open filter is with around a 220 and the use of a 60 pilot. I've found jets for about $6 each. The smaller the jet size, the less fuel will flow through it at a given pressure difference across the orifice boundary. A # 38 Jet is 0. PILOT JET: The pilot jet is a medium size (¾-1") brass jet located inside the float bowl next to the needle jet/main jet location. 948(Denver atmospheric pressure at 70 degrees) x jet size(60) = new jet size(56. The carburetor consists of following parts: pilot jet. Sizes #170, 175, 180, 185, 190, 195, and 200. When replacing carburetor jets or ordering the spare parts, refer to this bulletin and ensure that you are handling correct ones. Using data provided in here, i fired up excel to make a quick chart. 5 racing carburetor for sale, Assemblies: - TPS (throttle position sensor) - Cold start choke - Hot start choke - Oversize bowl drain plug - Fuel mixture screw remote control - Silicone vent lines + filter case with oiled filter insert - Velocity stack neck size ø 63. Keihin Carburetor Main Jets • this is images about keihin carburetor main jets posted by Maria Nieto in Keihin category. Please select jet size #100 - #180 from the drop down menu. 50 slow jet -. Carburetor - drawings, charts, and a how-to guide. The standard cutaway on the PWK i put on the KDX was #3. 15 PUMP JET. A chart showing the dimensions of the diaphragms we manufacture and notes on what motorcycles they fit. 2) Dynojet - Measured in mm. 65 slow jet - - 18-99314: keihin 76-89. If the temperature climbs to 95 degrees, a 162 jet is the ticket. There are NO Checkout Buttons on this page. It's straight from Keihin. These jets will be used with the following Keihin carburetor styles: FCR, CVVD, 26-30 VB VE, VA, CV, and CVK (not for personal watercraft). jetting range effectiveness chart. You can get a feel for the main jet in lower gears, but the ultimate test is flat out. Main jet Idling jet Starting jet Jet needle Needle position from top Slide Air adjustment screw open Performance restrictor Power jet nozzle 250SX Keihin PWK 38 S AG 180303 165 (162,168) 40 (38) 85 NOZG (NOZH/NOZF) IV 6,5 1 – – 250 EXC USA 300 MXC, EXC USA Keihin PWK 36 S AG 191102 160 (162) 35 N3EH (N3EW) III 7 – 171102 N3CJ (N3EW/N3EH. Small engine repair, lawn mower repair, engine troubleshooting, repairs and safety. Now I'm starting to worry slightly - I run 132. Further reading about carburetor jetting and. 5 turns out the jet manufacturer suggests. Everyone I speak with has the same problems with Holley carbs. Best top end with a wide open filter is with around a 220 and the use of a 60 pilot. Part Number 78-113 is used with R2 Carburetor. One of the best carb on the market today. #6 Wood Shank Hole, #14 Pilot, Hard-wood, #16 Pilot, Soft-wood #18 Pilot, Soft-wood. How To Make Precision Pilot Jets. Dynojet Jet Kits increase power and smoothness throughout the entire rev range, while maintaining optimum fuel economy. This is the range that is too lean for best engine performance on stock motorcycles. I got a #3. My guess is that with the sleepers on the exhaust side and the increased airflow on the intake you will need to at the very least start with size 142-145 for the main jets and see if the engine will pull well all the way up the RPM's. Sizes #170, 175, 180, 185, 190, 195, and 200. You can also find other images like keihin pilot jets,s&s carburetor main jets,mikuni carburetor main jets,honda keihin carburetor jets,adjusting keihin carburetors jets, and others. Mikuni TM 40-6. This is the recommended carburetor size for a 4-cylin-der engine that is tuned for road race use. The chart will not be a perfect match because there are many variables, for example, different carb flow characteristics, different needles, orifices etc. ive spent a few hours now lookin on the web for a chart for this but everyone i did find was just slightly different in there number systemi just got a keihin 28mm carb that i bumped up 2mm larger to 30the main jet from the keihin has a 150 in it and u can see that its a bigger diameter than the mikuni that has a 230 stockis there a formula for figuring this out?? thanks guys. i found this much but i would like to find the rest of chart that goes up to keihin main jet size of 200. I made a webpage detailing where these adjustments are. Main Air Jet: #110: Jet Needle: Carb 1 and 4 = N7SB: Carb 2 and 3 = N7SA: Needle Jet: 2. Below is a fantastic photo for keihin carburetor model numbers. Replace your small stock 38mm Mikuni Carb with this 38mm Keihin PWK Short body Airstriker for improved performance! Will be able to use the stock throttle cable also. I leave the forum, Google Kehein jet size specs and end up right back here lol Somedays I feel like my left foot is nailed to the floor and Im walking in circles !! Click to expand That's because this site is the BOMB!!! and most popular. How to determine the proper jet size on a Chinese scooter: Carburetor diameter(12mm) x 5 = 60(or number it calculates) x 0. However if the temperature dips to 55 degrees, the correct jet may well be a 178 even though the jet proportional to the air density change would be a 172. Carburetor jet available Slot Head Style (Needle) or Hex Head Style (Main). Because of their great performance they come stock on a lot of the leading brand bikes. Jet Ski Carburetor and Rebuild kits for Kawasaki Sea Doo Yamaha Polaris We carry Jet Ski Carburetors and repair kits for Kawasaki Sea Doo Polaris and Waverunner. Dynojet Jet Kits increase power and smoothness throughout the entire rev range, while maintaining optimum fuel economy. Type Keihin FCR-MX 3900B Keihin FCR-MX 3900B Keihin FCR-MX 4125A Main jet 178 178 185 Jet needle OBDVT OBDTR OBDTP Idling jet 42 42 42 Main air jet 200 200 200 Idling air jet 100 100 100 Needle position 3rd from top 5th from top 4th from top Starting jet 85 85 85 Mixture control screw open 1,25 2,0 1,5 Slide 15 15 15 Performance restrictor. 75 MAIN JET 1. The BS38 pilot jet seats inside the float bowl. The same goes for the jets; I prefer OEM Keihin jets, available from Honda dealers or JetsRUs. Main Jet Sizes. The way a jet is made changes the amount of flow it is capable of as well. Mikuni Hex Head Style Main Jets. How to measure the carburetor body to determine what size CV diaphragm you need and if JBM Industries has a part that might fit your vintage motorcycle. Don't hesitate to contact us with any questions or requests:. This is from various sources gathered over the years. thank you all for your great advice. states plus Washington, D. sachs wankel mikuni walbro grose jets keihin carburetors mufflers volt regulator bosch ngk prestolite fuji tohatsu bse condensor points ignition coil gasket crank shaft wiseco power dome sno max llp kimpex lemans piston marco grissley spi. 31,32 The pilot (42) and main (102) jets are marked with their sizes and the Keihin symbol. NOTE: To order jets, specify Series Number and Jet size. jet sizes available 100 102 105 108 110 112 115 118 120 122 125 128 130 132 135 138 140 142 145 148 150 152 155 158 160 162 165 170 172 175 180 185 190 195 200 Price: $7. Is there a chart available? Also I have been reading and it appears that aftermarket jets for the Keihin my not be the same size as OEM jets. It matches the other conversion with the Stock jet mft (Keihin) added Keihin* Dynojet* Mikuni 92 92 85 95 94 87. Keihin jets are numbered different than Mikuni, etc. Go to Mikuni parts listing Go to Mikuni main/pilot/air jet sizes and diagrams. Any idea what the number and the second letter are, as the spares kit also has a N8RW, N3RJ and N3RKI think, (I'm at work right now. I have look for a chart but I cant seem to find one that goes high enough. Keihin Jet Size Chart – keihin jet identification chart allens performance ltd keihin jet identification chart keihin jets are sized in steps of 2 and 3 eg 100 102 105 108 110 this is probably to avoid engraving “ 5” on the jets 116 size 5mm slot head keihin pb16 pb18 small atv pc18 pc20 50 100 Δ 2 3 7mm length honda atc70 78 85 trx70 trx90 kawasaki klx110 105 120 Δ 5 m4x0 75 suzuki dr. Sold in packets of 2 pieces and in dealer assortment kits of 12 sizes (2 pieces each size). Needle jets are not replaceable on Keihin so you are stuck with what they come with. Shindy carb rebuild/repair kit XR250R 1986-95 - 03-734 $21 eBay $24 RMAM The aftermarket parts in the Shindy rebuild kit (left picture just below) are keyed to stock Honda parts shown in the table and fiche. pilot = 40. The motocross world knows PWK. The following chart lists all Mikuni main and pilot jets and the part number of each that are presently available. Keihin FCR-39. Drill sizes to 1" diameter. Worked well in up-jetting stock carb and "fixin" the poorly bored jets in an other "modified" carb. 9 out of 5 stars 2 $19. 948(Denver atmospheric pressure at 70 degrees) x jet size(60) = new jet size(56.