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Re: How do i get my idle down on yamaha yfz 450 quad
Turn the idle screw anticlockwise half to one turn to set if this does not affect idle speed then you need to look further inside carbi or intake valves for other issues
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Question edited for full 'year make model (what it is).
Question moved from motorcycles to make model category.
Please don't type in all CAPS, it is considered SHOUTING and is harder to read.
'clips' and 'turns' it took me a while to realise you were talking about the carburetor and you were playing with the mixture screw and needle position! 4 turns out is a lot different to the factory setting which is 1 1/2 turns out.
If it is overheating it is running too lean. As you changed the stator, also consider the ignition timing. Popping can also be caused by the ignition failing under load, coil, lead and spark plug.
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 2. pull the fuel line off the carb, and make sure fuel flows from the tank freely. 3. If there is good fuel flow to the carbs, pull the carbs and clean them.
A bunch of things could be the problem >> valves scalded and stuck partly open, Rings seized to the piston, scored cylinder walls blown cylinder head gasket and warped cylinder head.
i have a 04 yfz 450 quad. the compression ratio like yours is extremely high. ive had my battery go bad and found that another battery other than factory would turn over the engine, but would not start. i paid the 100 dollars for the factory battery and it fired right up. because of the high compression you need a high cranking battery.
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