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2005 YZF-R6
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135 Posts
those compression numbers are out of range enough to be worth following the diagnostic tree.

when you're cranking it, does it try to start at all?

should you hear it trying to fire, but unable to run, might be a valve job due or damaged head gasket, but the headgasket on those is seldom the issue; however, those compression numbers suggest some sort of cross cylinder leak.
 
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