Question about 2001 Yamaha YZ 426 F

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I have a 2001 yamaha yz426f and i changed the oil and antifreeze,checked my valve clearance and i had it sittin in the garage and i went to take it out tonight and i had low compression, i didnt touch the cams at all, i didnt loosen anthing, not sure the problem. also, is there suppose to be oil where the flywheel is?? the bike was running awsome after i changed oil, then i went to check my valves for the season and now i got bad compression.

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  • Joel
    Joel May 11, 2010

    Is there a compression release on this bike? If so, maybe it is not disengaging after first revolution of engine after start.

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  • 52 Answers

Go back over it you prob have your valve settings wrong.

Posted on Jun 06, 2009

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