I got a mb35 out of water with out a load runs like a top if I put a load on it it keeps missing running, running low RPMs and wants to kill.. Checked the gas, air filter, oil, fuel water separator, everything just don't know what else to do. Any help would be good. Just don't know what else to look at. Thought it might be the carb and can run it till it burns out but maybe the coils?

Is it possible that it can be over heating?

What you mean by leak test? And no it's old plugs but still got fire.

Hey mine was doing same thing and I replaced coils. Plugs. Gas tank , line, filter, and all fittings. And that still didn't fix. I ended up reving mine up with prop out of water then started to trim down .it was spitting and sputtering and would bog down. I just held throttle wide open and feathered the trim to keep it running. Then all of a sudden something popped and it took off like a scolded dog. Has ran perfect ever since. Not saying this will fix yours but its worth a shot.

did you check the valve lash?

i had that happen on a godevil serface drive two screws backed out the carb that fucker would bearly do 5 mph so i got tires and rested my hand on top thee air filter and that mf took off ike a bat out of hell so i def would make sure the carb is bolted tight .....

What's the value lash?? And I haw the dual exhaust but it looks like one is putting out more than the other