
Eventually I got to the source of the problem - somewhat by accident, and it was the wet-lift muffler, which was dramatically overfilling with water due to the wet lift pipe having melted away before we got the boat. The water was flowing back into the cylinders when we were on port tack, and the spark plugs were getting wet, and that prevented the engine firing up.
Anywhoo, in Nov and Dec I found the problem, formed a new wet-lift pipe and got everything working again. Thankfully, the engine is starting perfectly now. Even after some hard sailing on both tacks. It is a huge relief!

Detailed Report.

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