My recently purchased 2004 Yamaha is in the shop, I posted the problem before on this site, but the mechanic calls me and says he did a compression test and all 4 cylinders had 110 psi, normal is 130, what could cause this, When I ran her for the first time it wouldnt pass 2200 rpms. Valve problem? cracked head? he also said the oil had no water in it. So rules out a blown head gasket
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