Tips for Pilot Fuel Screw Adjustment most 4-stroke MX Bikes Kehin FCR-MX Carburetor YZ250F YZ450F
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- Опубліковано 1 бер 2021
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. This is the same for all Japanese 4-stroke with Keihin FCR-MX Carburetor. If you are still having trouble with your carburetor post a question and we will try to help you. But the simplest thing to tell you is 4 stroke mx bikes can be very difficult to resolve poor running issues. The 1st thing to look at is when is the last time you have disassembked, cleaned and fully rebuilt your carburetor. I recommend you do that first. And I don't mean just spraying some carb clean in there and calling it A day. You need to completely disassemble this item, and inspect each jet for blockage. If your pilot jet is blocked, your bike will not start easily, and it will run like crap.
Other things to inspect are your leak jet, your needle, your throttle pump timing, and basically everything relating to the interior of your cooperator.
Other things of note will be your exhaust crush gaskets. There are 2 of them. Just Google it or look into your service manual. Also you should repack your exhaust silencer. If it has never been done, I highly recommend it.
Another thing to inspect will be the hot start mechanism. Make sure it is clean and functions properly, and has a recent O ring in the plunger in the top of your carburetor.
Aside from that, always follow your service manual for valve adjustment and top end rebuild schedules. These 4-strokes require frequent top end jobs. So if you have been 50 hours without a top end rebuild, I would start there.
If you are not familiar with how to work on these bikes I highly recommend you hire a professional mechanic. This will save you tons of hassle frustration and costold frustration and cost.
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For anyone viewing this - ask yourself when was the last time you tore your carb apart and physically inspected all of your jets? Make sure your float level is set correctly. Also, usually the pilot jet is clogged, and often the leak jet as well. But you should go through your carb on a fairly regular basis. AND you should never use ethanol-based fuels (standard pump gas) on any dirtbike. Always use non-ethanol fuels. Also make sure your hot start mechanism (where it enters the carb) is clean and functioning properly. AND make sure the throttle pump mechanism is adjusted correctly as well. (the procedure is in your service manual.) ALSO make sure your spark plug is recent, make sure the crush gaskets relating to your exhaust system is recent as well. These are all things many people ignore or overlook on the 4-stroke motocross bikes. This is assuming your topend is recent and valves are adjusted properly. AND make sure your exhaust (muffler) packing is recent as well.
I bought a Yamaha yz450f 2004 and I noticed that my bike was always popping out of the exhaust, then I wanted to look at the carburetor and I noticed that I don't have this screw to adjust. I only have the idle speed what should I do?
Thank you!!!!!!
When I screw mine all the way in and then loosen it a little, it becomes too loose and will turn on its own with vibrations. What could be the reason for this?
My ktm 450 exc has a strange problem with the fuel screw, last time I was out I adjusted it, got it running good and very responsive then as I was riding it slowly got worse again, like hesitant to want to go at low rpm in higher gears where as when I set it, it was responsive and smooth. I can't see why it would need adjusting more than once on the same ride. It definitely didn't move, as the fuel screw was in the same place. I could understand if a big weather change but on the same ride it's just very strange to me
Got an yz426 my dad finished building and I was wonder why I was having crank over issues I believe he had it set too lean, cause first kick it made a pop and then a couple kicks later it wanted to turn over but it died off
My bike doesn’t start with the choke on will start and run fine with it off but if I turn it on it kills the bike can you help
Is it normal on a yz450f for the first 12 inches of exh pipe to be cherry red at idle. Just bought one for my son, i have no experience with 4 stroke
Mine isn’t idling
I have a 2005 yz250f and I have a hard time finding a new frame guard for it. Do you know anywhere that might sell them I want a very basic simple looking one. I also see how they don't make restyle kits for them only the two strokes. I want to put a newer looking front fender on mine. I might get like a newer year fender and just re drill new holes
This is one of the best educational vids i have come across here on UA-cam .
That was helpful and you just got my bike running mint asf
Beautiful Steel Framed YZ450 - Thats a well looked after Machine! 👌
Well explained Sir, Thanks!
Great help ,thanks alot.
Excellent info thanks heaps.
hey what was that black nob next to the carb thats connected to it ?? because i thought that was the adjuster screw
Great video, I have a bone stock 2003 YZ 450f. I have to turn the Pilot out 4.25 turns to get rid of the popping. Carb is clean. It currently has a 42 pilot. Should I go up to a 45 or 48?
I got an 04' KTM 450 EXC that is driving me freaking insane. I won't idle for nothing, I have went through the carb like 15 times already in the past couple weeks. I have soaked the carb in carb dip, rebuilt the entire carb including the mid section. I have installed a JD Jet kit to try to get it running better. The throttle revs smoother with the JD kit but still pops like crazy after revving and the roms take a while to come back down after revs. Also it's hard to adjust because it runs super hot. Pulled back in the garage after trying to tune it and the carb is pouring gas out the overflow. I have posted that bike on Facebook for sale and I will go get a fuel injected model. Me and carburetors don't get along for nothing.
I have a 2004 yz250f and it’s bogging out real bad in the low rpms and after only a couple minutes of idling the exhaust right off the header starts glowing orange. Do u know anything I can do to fix it? I think ik but I wanted to hear maybe some better opinions