Honda kawasaki keihin cr special smoothbore carburetor. I should replace my throttle or transition slower when going from part to full throttle as signal will be lost. Kits are available for either horizontal draft or downdraft carburetors. Be very careful not to spray the exhaust or around anything hot and have a hose near by just in case. Service technicians forum user manual for fuji fcr xg1 thomas onyema conquest medical imaging please can someone help us with the user manual for the fuji fcr xg1. Fixing the dreaded lean bog on keihin fcr carburetors. In this database you will find the configuration for most of our carburettors as well as the part number for common spare parts. The keihin fcr carb rebuild with zipty racing dirt rider. The nut is used for adjustments, the screw is to lock the adjusting nut in position. Downdraft and horizontal single carburetors fcr28 fcr32 fcr33 fcr35 fcr37 fcr39 fcr41 download the pdf in resources below. Keihin flatslide pwk carburetor, oppinions, issues. The sudcomikuni tuning manual provides most of the necessary information regarding the maintenance and tuning of mikuni carburetors. Keihin carburetors are only legal in california for racing vehicles, which may never be driven on public highways or waterways.
Ive seen claims of 80 hp from stock carbs and careful jetting, but mine with the keihin racing carbs fcr 41s and aftermarket mufflers pulled much harder than theirs and also had a killer top end. It covers all the important topics in tuning your fcr racing carbs. Keihin fcr throttle valve cutaway tuning crfs only forums. Helpful tips keihin pwk and fcr instructions, exploded views, and. I noticed while installing it that it was different from the fcr mx carb thats in the write up here on thumpertalk. Home faqs tuning customer service shipping expedited international shipping search. I have just put up the keihin troubleshooting guide and the keihin cr owners manual up for. Helpful tips keihin pwk and fcr instructions, exploded views, and parts picture gallery. It cant react suddenly to change and they have developed the fcrs with a fuel pump to address this problem. Here is the access download page of honda ecu tuning guide pdf, click this link to download or read online. The main jet affects the jetting in the upper quarter of the throttle position.
The following is a copy of owned by orma divisione motori, the official italian keihin distributor hildo copied this section, the tuning guide, from, as a reference aid only, to tune keihin pe and pkw 28 carburetor as commonly used on 4stroke mini bikes. Im sure he still disagrees with some of whats here my dislike of changing float level, and even suggesting that one use a lambda sensor, for examples. After attending some ama road races over the last few years as a dynamometer operator for factory pro tuning and mechanic for ricci motorsports, and having the. Yoshimura head 125cc kit yoshimura head 115cc kit manifold kit for nsf100 racing throttle holder set for tmr small body nsf100l. Fcr tuning laymans version, not factory pro tuning guide. On fcr carbs the main jet, slow jet, jet needle, air adjustment, slow jet air adjustment and gas valve are different and located elsewhere.
Throttle v lve jet needle jet block main air jet nozzle nozzle holder main jet bore size seiection bypass port air screw slow jet the belmv the valtu. Most service manuals and even aftermarket companies have really complicated procedures for setting up the pump shot timing. Crspecial fcr ycnrself, will be made the ritht dlice. I think this because when you changed the air screw nothing. The way i find air leaks is spray a little carb cleaner or ether where you think the leak is. Helpful tips keihin pwk and fcr instructions, exploded. Keihin fcr flat cr carburetor rebuild kits powerbarn. Bowl you simply need to tune your carb using the adjustments that are already there. Dont hesitate to contact us with any questions or requests. The keihin fcr flat cr carburetor rebuild kits contain all the necessary genuine keihin components to rebuild your fcr carburetor. Welcome to pjmotorsports for all your keihinmikuni carburetors buy your keihin fcr, cr special, pwk, pj, pe, pwm. I recently ordered and installed a fcr 39mm carb on my 06 drz. We shall be held free from any responsibility or compensation whatsoever for any glitch in the parts other than ours if the glitch takes place after the installation and use of thse products. For example, the fcr kit curtissparks sells for the 400ex is a normal fcr while their kit for the 450r is the newer, better fcrmx variant.
Read online now honda ecu tuning guide ebook pdf at our library. This may prevent the carburetor from functioning properly. Read the owners manual for your vehicle before installing any keihin product to prevent any damage to the vehicle due to improper installation. The guidelines are the same for both 2 and 4 stroke. Sudco keihin fcr off road performance carburetor kits. If you do not have adobe acrobat reader, click here. Exc racing, mxc, 250 exc racing 2005, 400 exc racing 2005, 450 sx 2005, 450 mxc 2005, 450 exc racing 2005, 525 sx 2005, 525 mxc 2005, 525. Fcr single exploded view fcr28, fcr32, fcr33, fcr35, fcr37, fcr39, fcr41 fcr middle body rebuild kit 187968. The fuel screw opens or closes a bleed screw in the carb. There is very little in the honda service manual regarding the accelerator pump circuit. Join the community to be updated first on specials and latest deals. User manual for fuji fcr xg1 service technicians forum.
Figured id post this in case anyone else has trouble getting a good idle to 14 throttle with their crs. If i was a betting man id put my money on the pilot circuit being clogged. Carburetor tuning range chart, keihin needle chart with small. Logged give mea frame to build a bike on, and my imagination will build upon that frame. Use the electric meter dcv function to check the tps sensor output voltage. If you own a modern 4 stroke dirt bike, then it is equipped with a keihin fcr carburetor. If you make modifications to the products, we shall be held free from any guarantee of the products. First off what are the main differences between the two carbs. There are a number of pilot jets with extended shafts that allow you to tune by hand and make life easy when making. The sudco keihin fcr carb kits include a prejetted keihin fcr39 or 41mm carburetor and pushpull throttle cables that works with the machines stock twist throttle, otherwise a. Junk it it is useless for tuning, except for a rough idea before you actually tune as in just to provide a customer how bad the tuning is now as if the customer didnt already know. Turn the idle mixture screw or the air screw to for correct procedure, achieve highest speed and best response.
The idle mixture screw fcr controls fuel delivery to the idle port and the screw is. Many thanks to marc salvisberg, founder of factory pro tuning, for teaching me the finer points of using dynamometers and tuning carburetor equipped engines. Keihin fcr carb new test on the no more slowzuki drz. Accelerator pump diaphragm spacer in jet kit jdk015, jdk0, and jdk002. Keihin fcr single carburetor replacement parts motozone nz. The manual covers all mikuni aftermarket carburetors including the rs series, vm series, tmhs series, hsr series, tmx series, and bn series carburetors. View and download ktm 400 exc racing owners manual online. Get honda ecu tuning guide pdf file for free from our online library pdf file.
There is nothing wrong with the keihin fcr39 factory pilot jet mixture screw other than the fact it is tucked up into the carburettor body meaning it cant be easily accessed or tuned by hand. To get big time power, you start with keihin fcr 41mm carbs, a better exhaust system, and eventually bigger pistons and head work. We hope all this will be a valuable help for tuning your engine at its best. Quick and easy adjustments for better throttle responce. Fcr tuning manual is a lot better than the ones i wrote before i did my stint as a technician at factory. Mikes xs clearly states, our pwk carbs were dyno developed by heiden tuning and specially built by keihin for mikes xs for use on four strokes.
Fuels that contain over 10% alcohol content may damage parts in the carburetors. To actually use that, itll require something to analyze the exhaust. Keihin fcr flatslide carbs keihin crs smoothbore carbs most all offroad and mini. All kits are sold each so order the same amount of kits as you have carburetors. This section features the pwk exploded views just to let you understand where the tuning components are located. Way more information than you ever wanted on how to fell a tree. The more i read about these, the more im convinced they are selling knockoffs. I reread my sudco mikuni tuning manual this weekend and im not going to follow its instruction either. The earlier, nonmx fcrs still work i have a pair of downdrafts on a nt650.
The main jet does not affect the jetting for starting and. If you are not experienced in carburetor tuning, we do suggest that you purchase and read our sudco mikuni tuning manual to give you a much better understanding of how the motorcycle carburtetor operates, and how it and the engine are diagnosed, the carburetor disassembled, adjusted and tuned for the correct jetting and running. As complex as the fcr carburetor is, it is more intimidating to look at than it is to work on. Layout of the throttle cable is different from std cable.
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