'79 Johnson 140 spark plug

[JLOWRYinIL]

My other thread must have died for lack of information by me. Anyway, I bought new plugs this afternoon (Champion QL77JC4) and will take carbs off again to clean. The Napa guy had charts for the Johnson motors and this Champion plug was not listed. Every thread that I see with this engine recommends this plug if I am reading correctly. Before I put it in this evening I wanted to check with you guys and verify that I won't be knocking a hole in the top of a piston or something. THanks

 

[moderator1]

Re: '79 Johnson 140 spark plug

QL77JC4 is fine but the up-graded (and recommended)plug is QL82C.<br />I'm closing this thread, please refer to your other post.