Compression of 92 Yamaha 250 OX66, 250 hrs after rebuild.
Hey Anon,
The biggie is the compression difference between ALL the cylinders,,, there should not be a 5-10% max. difference between the lowest and highest readings.. if more.. I would question the rebuild quality,,(My V6 is all within 5 psi after 13 years - (I rebuilt it!!) The longevity is based on how hard you run it, the quality of the oil and fuel you run and how clean you keep inside the cowl....
The engine could last for a long time.. or break tomorrow...no way to know??
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