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post #5 of Old 09-26-2007
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3100 rpms on a yanmar designed for 3600 rpm is WELL within limits and should be able to be run indefinitely at this speed. I had a 4JH with 80-90% of rpm limit and ran for years with NO problem whatsoever. MackBoring will tell you that running at 80-90% is ideal & they should know. Of course it is possible that the boat is over propped but if you are not seeing smoke normally at this speed then I would say to check the things Melrna mentioned before I throttled back permanently.
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