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Or you could look in the manual and use what Yanmar recommends. Your mechanics method does not factor in an incorrect prop or any of the other problems that can limit RPM - you'll just run at 80% of an incorrect RPM.

This. When my 2GMF is hot it only takes a bump of the switch at idle to start - just the same as my digital injected cars. Cold it takes full throttle and 4 or 5 seconds of cranking to light.

Then why does Yanmar say "full throttle" in the manual? My 2GMF has a lot of trouble starting other than WOT. So did my other 2GMF So did my 3GMF So did my YSM8 Full throttle till it lights then pull it back.