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How Do I Check Decompression Clearance?

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I have a 2007 CRF450R. I understand how to check exhaust and intake valve clearance, but I do not understand what they mean by add the exhaust and compression clearance together and the total is what you need. Where do I check the clearance for this number? Does not make sense to me. How do you have to separate clearances on the same valve? All help appreciated.




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