My fishing partner has a 1995 Johnson Fast Trak outboard that starts and runs fine. However, after running a long distance, the motor will chug down and begin to run like a race car that is hitting the rev limiter. If we shut it down and let it cool off, it will run fine until it does it again. I expected an overheating problem and changed the water pump. That did not fix the problem. I could use some help if any of you fellow Johnson owners have experienced this problem.
