correct spark plug

patrick4266

Chief Petty Officer
Joined
Nov 29, 2007
Messages
591
Could some one please tell me the correct spark plug and gap for a 1985-70hp evinrude?
 

Daviet

Fleet Admiral
Joined
Sep 24, 2008
Messages
8,958
Re: correct spark plug

I beleave you need L77JC4 plugs gapped at .035.
 

patrick4266

Chief Petty Officer
Joined
Nov 29, 2007
Messages
591
Re: correct spark plug

The plugs I bought are L77JC4 but i was looking in this manual and it said qL77JC4 and called for a .40 gap, thats why i asked. They were gaped at .28 which may be why it was running bad. #1 cylinder seemed to be missing so I pulled the wire off while running to see if that was the problem. When I got it off and it was still jumping to the plug the motor smoothed out so I took out the plug and found out it was set at .28.
 
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