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Compressions on a ox 66 yamaha

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Vessel Info: Buying a 2004 wa 24 tournament

Compressions on a ox 66 yamaha

Postby Hayair » Wed May 04, 2022 8:13 pm

Just bought a 2004 wellcraft with a 200 Yamaha ox 66 on it, all cylinders show 85 psi, is this o.k. Or should I be looming for new powerhead. Thanks. Hayair

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2002 270 Coastal, Twin Yamaha 4 stroke 250
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Re: Compressions on a ox 66 yamaha

Postby CptBill » Thu May 05, 2022 3:39 pm

normal compression should be 125-150 but there are a lot of factors that will lower the #'s things like partially open throttle and so on. I have never had an engine that showed the exact same # on all cylinders always a lb or 2 different. try running the motor for a while so everything gets lubed up then retest it
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