Re: Motor slipping under presure
Welcome aboard Bricknell!! I mpved this over top Chrysler OBs as opposed to Chrysler boats.
My first first guess, and easiest to eliminate, is what we call a spun prop hub. It is caused by the inner hub of the propeller separating from the outer piece that contains the blades. Scribe a mark between the two, then run her, and inspect. Lines lined up, then it is another problem, lines are not aligned anymore and you just need some propeller work . . .
This could also be simple ventilation of the propeller, both would be rising RPM when more throttle is applied. I assume that's what you mean by "pressure".