Honda 5-hp. To achieve really great fuel mileage, this engine has really tiny carb jets, so tiny that they clog very easily, requiring a carb cleaning / rebuild to fix the problem. Yes, even when running the motor dry after each use and even when adding stabilizers to the fuel. Several years ago I started using aviation fuel and haven't had a problem since. It costs quite a bit more than regular gas, but I only use about 6-gallons a year ... Much cheaper than carb repairs. Aviation gas is very stabile - never any varnishing / deposits or starting problems since I've been using it. Apparently this is a common problem with these motors - met a frustrated sailor last weekend who lost a whole day on the lake due to his Honda failing to start, apparently for the same reason. I cannot recommend this motor.