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I have a montauk 170 2004 , I am second owner . When i plane off and cruise at 4200 rpm or less it runs fine , AS soon as I increase throttle above 4200 to 4400 or more it runs for about 30 seconds or less and drops down below 3600 rpm. I can plane off again imediately but i dont know whats wrong. My mechanic rebuilt the fuel pump and cleaned the carbs this week and it runs alot better and smoother but i still lose power at higher RPMS.
Assuming the gas vent is ok can someone tell me how to eliminate the throttle controls from being the culprit. Any other clues before i try my mechanic again . It seems he will have to take it on the lake.
It sounds like either a fuel restriction at hi demand or it's loosing spark at hi rpm. The best thing you can do in this situation is let the mechanic see the problem. I encourage my technicians to "water test" many of our boats with this type of problem. It may be something as simple as a loose ground on a coil, but assuming your mechanic is a Mercury tech, it'll do you and him a lot of good to see the problem for himself.
