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1980 115 Johnson ignition question

K

kuchupa

New member
I have one cylinder that's not firing, at least the plug is awfully wet when I pull it as soon as I kill the engine. I have replaced all 4 coils (cause they needed replaced) but still not firing on that one. I have switched the plugs around and the problem isn't the plug. Where do I go next? Power pack or is there something else I should check first?

Thanks,
Dave
 
Check compression, sparkplug may be black and wet because there is no heat produced in the cylinder that " is not firing " .--------------Check to see if you have spark on all 4 that will jump a gap of 7/16"and with a snap you can hear.-------Testing and trouble shooting is the path forward.
 
Thanks, racer. I finally rounded up a helper to turn the key while I held the plug. It does have spark. I didn't check the 7/16 gap but plug is firing. I will check compression next.
 
Update. I checked compression. 120, 120, 125, 130. With the 130 on the cylinder that is giving me trouble. While I had help I also checked spark on all four and they all throw a good spark across 1/2" or so.

Still runs a little rough and the plug on that one cylinder is still awfully "wet".

More thoughts/ideas?
 
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