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Hey Blue Heron I think once you finish tweeking that 200 you should easily get to 50 mgh. I have a '76 20'MA I just repowered with an Evinrude E-Tec 175 and at 5350 rpm I am at 51-52 mgh according to Garmin with a 21 pitch prop. Good Luck
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Hey dljohn,
Looks like we're neighbors. I'm in Newberry and work in Gainesville.
Your numbers are kinda what I was expecting. The performance I'm experiencing is more what I would expect from a 150. My expectations are based on my 10+ year old memory of a friend's Potter 20 MA with a 150 on it. I'm still trying to figure out to what extent it's because of differences in the hull, or because I'm running this Frankenmerc on it.
I took it to P&J Marine and they stuck it on their Dyno. The torque value they gave me was 95% of the minimum for a 200, but I don't know what rpm they measured it at, so I can't calculate horsepower. If it's a linear conversion, and merc's minimum torque spec for a 200 is at 200hp, then mine is developing 190 hp.
Anyway, thanks for the input. Every extra data point helps. I'm gonna keep tweaking. BTW, how high is your motor mounted? Where is the cavitattion plate in relation to the bottom of the hull at level trim? Mine is about an inch above.
Thanks,
Dave