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how much compression should a crf-230 have?

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A stock CRF230 should have @ 190 PSI with the engine warm and holding the throttle wide open.

I hope this is the data you are looking for.

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well i checked my compression today, stuck the compression tool in my spark plug hole and my dad turned the bike over and i am only reading about 90 psi

by the way how do you check compression while engine is running? My compression tool go's in the spark plug hole

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You don't check it with the bike running, just holding the estart button for 5 or so seconds with the throttle wide open

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