1985 johnson 70hp VRO sparkplugs and gap

[smkonwatr]

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]

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]

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