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Compression issue?

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I've had trouble starting my 2012 crf250r it feels like it is lacking compression, would it need a rebuild? Any help?

Edited by MainStream

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probably time for just a topend change, but check the valve clearances first. If they're fine, remove the topend, and replace it. WHile the head is off, check the valves for leakage. I'm doing a CRF250r for a guy right now. He was convinced it needed a new topend, as it was getting harder to kickstart so he brought me a 280 kit to install. I checked clearances, and they were good. Pulled the topend, and checked the valve seal. The intakes were leaking pretty good, one more than the other. Time for a proper valve job. Piston was visibly worn, and rings didnt look too good either.

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Thanks for all the help guys, does anyone know how much a rebuild would cost as i am not too good with mechanics?

P.S I'm in australia

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