Question about 2004 Yamaha YZ 250 F

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Cant start my 2004 80 ws raptor

The starter works but I cant start it looks like that is no compreshin in the cylinder when I crank the engine but the piston is moving OK But thet is wary litel comresin inside the cylinder.
This is a 2004 yamaha raptor YFM 80 WS model

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  • vtrktrmn May 11, 2010

    Do a compression test and that way we will know for sure what direction to go, If you have been racing this bike it is possible that while down shifting it got over revved and bent the valves.... I am sorry to say I have done this myself.....

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Buddy sounds like your piston rings have wore or broken strip the barrel off and replace rings making sure you put oil on them when you install

Posted on Sep 08, 2009

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No crank no start problems


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