Home › Forum › Ask A Member › 1956 Johnson 30 hp won’t accelerate boat up on plane! › Reply To: 1956 Johnson 30 hp won’t accelerate boat up on plane!
I took the boat out yesterday fully convinced that I had the problem taken care of by adjusting the set screw on the little rod that goes from the throttle rod to the carburetor. Unfortunately I still have not solved the problem. I moved the set screw from one end to the other with little to no change in the way the motor ran. I ran the boat for about an hour and pulled the plugs to see what they looked like. The top plug looked good but the bottom plug looked shiny black but not wet. I checked the spark and both plugs were delivering good spark. I checked the compression a couple of days ago and both cylinders were at 120 lbs. Can it be running on only one cylinder if I have good compression and good spark? Should I try running it with the bottom plug wire off and seeing if there is any difference in the way it runs?