Question about 2004 Yamaha YZ 450 F

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Every time I start my yfz 450 I hit the throttle it hesitates when it starts then pops I bit doesn't seem to have the power that it should. I replaced the air filter and the main jet and pilot jet however it is still doing it. Plase help me wight the problem

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Can you adjust the main jet? Have you cleaned the varible jet or slide? What shape is the vacumn diaphram in? Have you checked the ignition timing,i presume it is solid state ignition?
How about the carb did you clean any with gummout?

Posted on Sep 06, 2010

  • brentongriss Sep 08, 2010

    Haven't really done anything yet kinda afraid to. Not really knowledgeable in this area. All that has been done is new air filter and new stock main jet and pilot jet don't know if main is adjustable or not

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1 Answer

I have a 2004 Yamaha YFZ 450 the bike will start and drive but as soon as it warms up when you push the throttle it starts to cut out... What is the problem?


There is not really enough info in your post to narrow down the problem. Hesitation during acceleration can either be fuel related or ignition timing related. Once up to speed, will it maintain that speed smoothly?

If you have a timing light, check the timing at idle. If it is OK, then it is probably fuel related.

Assuming you have not messed with the ignition timing, if it idles, but won't accelerate, it is probably starved for fuel. 1.Check/change the fuel filter- easy and cheap
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Hi, Anonymous and the usual suspects are:
1. Idle circuit and transfer ports clogged.
2. Air fuel mixture adjustment too lean.
3. Pilot jet clogged.
4. Faulty accelerator pump.
5. Float level too low.
6. Float bowl contaminated old fuel, water, dirt, rust, etc.
7. Float bowl vent or overflow tube clogged.
8. Fuel flow to carburetor restricted.
9. Intake manifold leak.
For more information about your issue and valuable "FREE" downloads that you will need please click on the links below. Good luck and have nice a day.
Yfz Dies When Hit The Gas
Bike dies when you give it throttle
YAMAHA YZ450F Owner Service Manual
OEM parts for Yamaha
http://www.yamaha-motor.com/assets/service/manuals/2004/lit-11626-17-11_784.pdf

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http://pdfdatabase.com/download_file_i.php?file=14074911&desc=Yamaha+YZ450F+Service+Manual+.pdf

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