Gap of my Johnson

M

msms

Recruit
Joined
Jul 8, 2007
Messages
3
Does anyone know what the spark plug gap should be for a 1974 Johnson 85 outboard, electric ignition?

Thanks
 
danond

danond

Lieutenant Junior Grade
Joined
Jun 11, 2007
Messages
1,118
Re: Gap of my Johnson

My clymer manual says .040 for a 75, and has a dashed line for a 74, indicating a non-adjustable gap plug (UL77V). You sure you have the right plugs in the engine?
 
bigbob_FTW

bigbob_FTW

Petty Officer 1st Class
Joined
May 10, 2007
Messages
290
Re: Gap of my Johnson

L77JC4 plugs gapped to .030. If you do a lot of trolling or slow speed operation, increase the gap to .040
 
E

ezeke

Supreme Mariner
Joined
Sep 19, 2003
Messages
12,532
Re: Gap of my Johnson

Thanks JB
 
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