You should be turning more like 5800 RPM. You need to play with the prop. I have the same engine with CMC'd carbs and a new reed plate. It dinos at 65.5-66hp. The rev limiter is gone. You can safely run it at 6000rpm. The best I can get is 5900RPM and that is by myself with no load. I run a heavy boat. 1648, all 100gauge aluminum, steering console, floor, 3 batterys, trollin motor and 12 gallon tank. I can get er up to 40mph.
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