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post #13 of Old 12-18-2012 Thread Starter
73Morgan
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Re: Full throttle needed to start Yanmar 2GM20F

I looked into compression, and I see that the manual says the Compression Ratio should be at 23, multiplied by atmospheric pressure 14.7, this equals 338 PSI. Surprisingly 350 is above that. The Mechanic did say he took the compression with a warm engine. He also said that the rings might be stuck/frozen, this might make a difference with a cold start. It looks like he might be on the right track.
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