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high compression

  1. 07 yfz 450 high compression after rebuild

    YFZ450 & YFZ450R General talk
    07 yfz 450 high compression with stock engine So i changed out the cylinder and piston on the quad after i had smoke leaking out of the exhaust head. Ended up changing out the piston and cylinder. Wanted to do it soon anyway. Put it all back together and got two very loud pops on start up...
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