Trying to track down a problem with my Merc 4HP 4-stroke dinghy outboard.
It starts fine and runs great at moderate speed. However, when I open up the throttle, it sputters and won't reach a smooth top speed.
I suspect a fuel issue. I've changed out the fuel filter and put in a new spark plug. The old one looked exactly like the "perfect" example on the spark plug charts I checked. Of course I've run hours' worth of fresh gas through it. I even bought a gallon of that $20 engineered fuel they sell in the home supply stores and ran a tank of that through.
Next steps? Carburetor rebuild? Something else in the fuel system?
Hoping someone has seen this before and can point me down the right path.
It starts fine and runs great at moderate speed. However, when I open up the throttle, it sputters and won't reach a smooth top speed.
I suspect a fuel issue. I've changed out the fuel filter and put in a new spark plug. The old one looked exactly like the "perfect" example on the spark plug charts I checked. Of course I've run hours' worth of fresh gas through it. I even bought a gallon of that $20 engineered fuel they sell in the home supply stores and ran a tank of that through.
Next steps? Carburetor rebuild? Something else in the fuel system?
Hoping someone has seen this before and can point me down the right path.