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Yamaha MX & Off-Road Dirt Bikes
just got a YZ 250. it wont crank
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[QUOTE="rmc_olderthandirt, post: 1336887, member: 68872"] I am a little confused about the sequence of events. The previous owner had work done at the dealer and when he got it back it wouldn't run past 1/2 throttle? Why didn't he take it back to the dealer and have them fix it? I am a little suspicious of the power valve. It is possible that the power valve itself is OK but it has become disconnected from the governor or the governor is all messed up. If you don't do it right you can really mess up the linkage when you take it apart to rebuild the top end. If the bike did run OK when the previous owner got it back from the dealer and then all this started happening after it sat for months then I would suspect the carburetor, probably the pilot jet. When you were trying to start it did you check the plug? Was it wet or dry? Normally when you are unsuccessful at starting the plug will be wet, if the carburetor is working even halfway right. If the plug is dry then you have a fuel delivery issue. It could be that there is a clog at the tank that simply isn't letting enough gas into the carburetor, although I would expect it to start and idle OK. When you got it started did you run it long enough to get it warmed up? Another possibility is that there is raw gas down in the lower end. If this is the case it will run very poorly until it is all gone. [/QUOTE]
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Dirt Bike Discussions By Brand
Yamaha MX & Off-Road Dirt Bikes
just got a YZ 250. it wont crank
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