1985 johnson 70hp VRO sparkplugs and gap

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smkonwatr

Cadet
Joined
Feb 8, 2008
Messages
23
I use champion QL77JC4 plugs gapped at 40th.,I am getting conflicting info from forum.Is there a service bulitin that states a change to 30th. gap?
Thank You, Mike
 
guy74

guy74

Senior Chief Petty Officer
Joined
Jul 12, 2007
Messages
794
Re: 1985 johnson 70hp VRO sparkplugs and gap

On my 1988 60hp Johnson, I found that it idled better with the plugs gapped at .040. The specs in my service manual do call for a gap of .030.
 
HighTrim

HighTrim

Supreme Mariner
Joined
Jun 21, 2007
Messages
10,486
Re: 1985 johnson 70hp VRO sparkplugs and gap

You can refer here for the plugs and gap

"http://www.boatsetup.com/SparkPlugChart.html"

It is reccomended to gap them to .030, however, if you do heavy idling or trolling, I would go to .035 or .040
 
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