Re: max rpms on muffs for a rebuilt motor
The cam lobes rely totally on oil splash from the spinning crank to lubricate, hence the 2000 RPM. this 20min break in is the most critical once your by that it's all good. Just monitor the engine temp and shut down if temp gets much above 180 or so, a newly rebuilt engine will usually generate more heat than usual. On the lake vary the throttle like everyone says, power the engine up then back off, run at all different RPM's stay away from anything steady until after the first couple runs, by then the rings should be pretty well seated.
And as far as the muffs go, as long as your temp stays in range dont worry about it, just make sure your water supply doesn't get cut off like a kink in the hose or someone stepping on it, I think the main problem with muffs is if you have too much pressure the water will aereate and be full of air bubbles, you want to adjust the pressure just so your feeding ample supply to the waterpump and not causing aereation or for a better word cavitation. Good luck.
