.030" or .040" spark plug gap for evinrude 85 v4 140 vro - Please help!

[irocz_man]

Trying to determine proper spark plug gap as I'm finding contradicting info between Clymer Manual and Continouswave.com (not sure how trusted of a source that is)...
I have an '85 v4 140hp vro (with VRO disconnected) and the Clymer manual states gap is .040", while continouswave.com has a sheet that says it's from '07 that says .030" is the gap size...

Which one should I go with please?

What are the advantages/disadvantages on idle, slow speed and WOT speed of each?

Thank You!

 

[fireman57]

Re: .030" or .040" spark plug gap for evinrude 85 v4 140 vro - Please help!

If you do a lot of low speed trolling or pulling a tube slow then set them at 30. if you run mostly WFO then set them at 40

 

[mrmamiller]

Re: .030" or .040" spark plug gap for evinrude 85 v4 140 vro - Please help!

I had asked this question some time ago and got the reverse answer. Curious.

 

[Pat2009]

Re: .030" or .040" spark plug gap for evinrude 85 v4 140 vro - Please help!

I have a 78 115hp, searched a long time to determine the correct gap. Opinions are split between the two settings. I finally gave up and gap at 0.035. Tried 0.040 but by the end of the season, the gap tends to increase a bit. 0.030 tends to foul a bit more, although I do not know why.

 

[fireman57]

Re: .030" or .040" spark plug gap for evinrude 85 v4 140 vro - Please help!

Sorry, I'm a dyslexic typer. Got them backwards.

 

[seahorse5]

Re: .030" or .040" spark plug gap for evinrude 85 v4 140 vro - Please help!

The Continuous Wave website has the official Johnson-Evinrude factory sparkplug chart on it. Go with the factory recommended .030" plug gap.