I got a 1957 Johnson 10hp (QD-18) motor runs awesome, but at low speed it like misfires or fires out of time, the motor will jerk when it does this. used to do this occaisionally, now it is doing it very often this year. I also noticed that when it does this it blows hard into the tank pressure line. I was going to replace the points and condensers, but havent been able to find them. I looked on i-boats and also sierra, but the sierra site is hard to find stuff without a part#. I was also thinking that it could possibly be the plug wires, maybe jumping from one to the other since the are so close. Anybody know if the wires are replaceable, or if I gotta get new coils to do that? I've had this motor and used it every summer for 12 years. never had a problem, always starts on the first pull. But the jerking is getting bad. So give me some feedback if you would please. Also if you know points gap. thanks.
