Re: 9.9 Johnson Carb Question

[David Stanton]

Thanks guys for the spark plug tips. I never thought about gap alignment before, although I have played around with changing the gap on problem motors with mixed results, and I have put a higher heat range plug in one cylinder if the plug consistently comes out looking wetter/blacker than the other and this often works! Orientation of the electrode may explain why a 9.9 Johnson I worked on 3 years ago went from terrible to perfect idle when I put in new plugs, although I did change from Champion to NGK. Maybe the alignment just happened to get right with the new ones?…although NGKs just seem to work better in some motors.

Dave