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Yanmar 2GM-F hard start/rough running
My 2GM just started acting up (oh the shame to be towed home by one of the boats who beat me in a race!) last night. Before this it has been very reliable having not failed me (in this and the previous season that we've owned it).
After our post-race raft up, I started it up normally, set the revs to about 2000 for some warm up, then in less than a minute it quit. It has never done that. It took a lot of cracking and fiddling to get it started. It would usually start, but stop within a few seconds. The times that it would stay running, it was running roughly (varying rpm) with not much power.
The race itself was quite bumpy and at high heel angle. The only other symptom I have it the previous week on the way home the throttle had to be held up to get the rpms over about 2200 but when you held it up the power was there to get the rpms up. I thought that was fixed with some WD40 on the cable mechanism at the engine end.
Does this sound like a fuel issue or maybe something in the governor?
C&C 29 Mk2 in St. Margaret's Bay, NS, Canada