My 20 year old 2gm 20 is very slow to start from cold. It turns over but doesn't fire. I leave it a bit, try again, often end up turning off the water inlet so I dont flood it. Eventually it fires. Once its been run it springs to life at the touch of the button for the rest of the day. The batteries are new and usually fully charged with smart charger and wind gen. It uses no oil,doesn't smoke except when cranking it to start it in the first place, the injectors were just serviced and it never misses a beat when running. the compression was tested recently and found to be about 230, down from an ideal of 300. I assume the low compression is the reason for poor starting, but the fact is uses no oil suggests that this is more down to the valves than the piston rings. At least this is what I hope as reconditioning the head is viable, if it needs the pistons doing as well it is probably not worth it. what you think? I'm not that knowledgable about engines, this is gleaned from talking to the Yanmar engineer and a bit of common sense and I would welcome a second opinion.
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