Orignal problem, motor hard to start. Took it to mechanic, he put on a new primer solenoid and upgraded seals in carburators. When I got it on lake I could'nt get boat up to full speed or motor to full power. I've had it back and forth to mechanic four times. Each time he's unable to duplicate problem. He suggested I change fuel pump. The new pump and hose and bulb did not fix it either. Last week he tested it on lake and told me it ran fine. He only made a small adjustment to carburator. Today I went fishing, the motor started fine. I was able to get boat up to full speed and motor to full power. I moved from place to place fishing and would shut down and restart motor each time. When moving to each new spot I would get up to full speed with no problem. Then during about the fifth move the motor was hard to start and smelled like it was flooded. Once I got it started I engaged prop and ran boat up to full speed. As I was moving along I reduced the power some then when I tried to go back to full speed it wouldnt go. After that it would not go above half power and speed. It went back to same problem. It acts like it's running on just one cylinder. Why would it run good some times then the rest of time run at half power?