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YZ250 Rebuilt top end, still no compression


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how do the reeds effect the compression? makes no sense to me. once the piston makes the stroke and blocks the ports up the compression has no where to go besides the head, between the rings and the cylinder or out a port if the piston is backwards

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Sorry thought it was a 4-stroke, anyway yes reeds can cause problems. Think of your reeds as a intake valve, if it does not close it will not run correctly. With the reed cage in your hand and looking through it from the intake side you should not see any light, if so there is the problem.

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