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05 yz250f no compression??

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so last week riding with my buddy and my buddys bike blogged out and died about 5 minutes of light riding and theres no compression now. they was not loud sounds and the bike started 2nd kick that day so valve were fine. the bike did have of lot of vibration for the last 10hrs on the bike planning on ripping it down but what should i be looking for??????? anything good :thumbsup::worthy::ride:

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Start with pulling the valve cover and checking valve clearances, if you have one that is really large, the valve may be bent or stuck open.

Make sure the decompression leaver isn't stuck open.

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