RE: Mainship 390 gph?
John,
at 2500 rpm's my 390 does 10 kts. On the Mainship board there has been a lot of discussion about the best speed to run the Yanmars. users and mechanics alike have chimed in on this point and the answers are all over the place. the Yanmar dealer mechanics that have given their opinion say you can run at the lower speed as long as you run to 2400-2500 rpm's for 5 minutes every few hours, and thats what i do.
John
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