Reply To: Johnson TS 20 Spark Issue

[Rusted Junk]

Hi Frank,
I don’t think it a TS 15 plate, anyway I have tested the coils that way, the top coils shows OL and the bottom gives me 7700 Ohms. I had a good spark on both cylinders so I ran it in the tank and it stared fine but as it warmed up it would drop a cylinder under load, I am assuming it’s the top cylinder but with the screw on plug connector I can’t pull it off while running the motor. Once it drops a cylinder it runs not so good and most of the time dies. After it cools down it will start again and repeat the failure. This motor doesn’t have a lot of compression (65 ) so it’s never going to run real well unless the rings come around or I go into the power head and hone and put new rings in if that all it would need, any suggestions there would be appreciated.
So I think I’ll look for a used coil and start there .
RJ