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Old 10-15-2009
badsanta badsanta is offline
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Have you checked the exhaust elbow yet. It will rust and clog up after awhile and is to be changed every few years so I am told. I had similar problems as you. I found an oil leak on the external oil line, antifreeze from the water pump and had a barnacle encrusted prop. It was an adjustable prop and when I serviced it I did not set it right and it ran worse than ever. I reset it properly and it runs fine. My exhaust elbow was so blocked I dont know how water got through. At higher RPMs I also had a foul oil smell that is now gone. From what I read that alot of yanmar 2gm and 3gm30 are over propped and never get to cruising rpm before they start smoking.
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