" I have a 1987 Johnson 200 hp
" I have a 1987 Johnson 200 hp I mix the oil 50:1. It runs good at idle, and it will run for about 3 minutes with no problem at full throttle, then it starts shaking really bad and I slow it down, and it runs fine. I try increasing the speed again and it starts shaking really bad and won't go any faster. I will then cut the motor off in the water for about 3 minutes, I will resume max speed with no problems. The spark plugs are about 7 months old.
This problem is driving me crazy. "
" I have a 1987 Johnson 200 hp I mix the oil 50:1. It runs good at idle, and it will run for about 3 minutes with no problem at full throttle, then it starts shaking really bad and I slow it down, and it runs fine. I try increasing the speed again and it starts shaking really bad and won't go any faster. I will then cut the motor off in the water for about 3 minutes, I will resume max speed with no problems. The spark plugs are about 7 months old.
This problem is driving me crazy. "