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I just put a Wiseco 12.5:1 standard bore piston in my 03 CRF450. The bike is much more impressive over stock. My question is this, should the higher compression motor be a little harder to start than with the stock piston. It starts fine it just takes a litte longer when its cold. Please advise.

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well its not that much higher, and i see problems from to low of compression on hard starting------i dont know how they start stock with only 68 to 70 lbs cranking compression anyway-------most all our motors have the decompression taken out and they start way better

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I just installed a 12.5:1. It is a little harder to start and it takes a little longer to warm up.

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