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Dirt Bike Discussions By Brand
Dirt Bike Brands - Other
YZ250WR wont start???
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[QUOTE="rmc_olderthandirt, post: 1271378, member: 68872"] There is a YZ-250 or WR-250 but not a YZ250WR The YZ and WR look a lot alike, but the WR would have a kickstand, an 18 inch rear tire and a few other minor observable differences. The big difference is in the transmission. Let's make sure we are talking about the right thing. I am assuming it is a WR-250, which would have the air screw on the right side of the carburetor and the idle speed adjustment on the left. It also has a lever for operating the cold start enrichment (choke) that is operated on the left. I don't understand what you mean when you say the bike doesn't idle, and when you turn the air screw out it dies. Will it die even if you are reving the engine up? I would not expect the bike to idle with air screw all the way in. Like Mox69 said, I would start by properly cleaning the carburetor. This involves a soak in a really nasty solvent. I highly recommend a new set of gaskets and possibly a new float valve. You will need the manual so that you can set the float level properly. Making any mixture adjustments without the float level being proper will be a waste of time. If the carburetor is clean and the float level is proper the next step would be to get it to idle. Turn the idle speed up to whatever you have to in order to keep it running. Now adjust the air screw for best (fastest) idle. Now turn the idle speed down a little, as low as you can take it and keep it running. Adjust the air screw again for best idle. Keep doing this until you obtain an acceptable idle speed. IF you are able to get the idle acceptable, don't mess with the air screw! It is only for idle. If there are problems with bogging, sluggish or top end then you need to work on jetting, don't try to compensate with the idle circuit. Rod [/QUOTE]
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Dirt Bike Brands - Other
YZ250WR wont start???
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