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Message: [QUOTE="darringer, post: 1147290, member: 26849"] I have had bad luck using compression readings alone to tell how much a top end is worn. For example, my '99cr250 would pull consisitent 210-215psi readings over the course of a year and a half. At teardown, the rings and piston were out of spec. This has also been the case on my '02cr as well. Although the compression did drop from 180 to 175psi over about a 9 month span. That is still only about a 3% drop. Hardly noticeable. I believe the only sure way to tell how things are is to open it up and measure. For the short amount of time it takes, and the inexpensive cost of gaskets, it's cheap insurance against catastrophic engine failure. [/QUOTE]