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Just a simple question....

D

DragonflyMU

New member
I haven't replaced my spark plugs in a - well I won't say how long. I know which plug to get, but I don't know if the new plugs will have the proper gap, or will need to be set before installation.

Thanks for the assistance in advance.

Dragonfly
 
Okay, i realize my simple question was a total misnomer. I didn't provide any information. I have a 1989 Evinrude 60 Electrric start, HP trim and tilt motor. I don't really know how to measure the shaft length, it is on a 16' Mitchell CC, so I think it is either a 22.5 or 25" shaft. The model number tag is barely readable, but I think it us the "T" tracker model. It was originally a VRO system, but after being rebuilt in 1999, the VRO system was removed. I was told to run a 50:1 fuel/oil mix with regular alcohol free gas which is what I use..
The original OEM plug is no longer listed, but the Champion spark plug recommended is the QL77JCH. The spark plugs in the engine now are L77JC4, which I bought at a Johnson/Evinrude dealer/service maybe 3 or 4 years ago..

I pulled a couple plugs and looked at them. They appear good except to me it seems to me that there is a lot oil on the plugs. Should I burn a hotter plug, or maybe reduce the oil/fuel mix? Or is this normal. What is the consensus on a plug brand? Is NGK worth the extra cost?
 
No, NGK is not worth the extra cost, never will be!

Stick to the Champion spark plug.... The proper recommended plug for that engine (1989 60hp Evinrude/Johnson) is the QL77JC4 plug.

The gap setting can be either .030 (long life)... or .040 (super hot spark)... your choice.

It makes no difference what the shaft length is, however measuring down from the underside of the transom bracket when it would normally sit on the transom to the cavitation plate just above the propeller gets you the proper measurement... whichever is closest to the following:

15" - Short Shaft

20" - Long Shaft

25" - Extra Long Shaft
 
Joe, I have always wondered, some 55 years now. That horizontal plate above the prop that separates the prop from the water surface while "on step"........isn't it properly defined as the "anti-cavitation plate"?
 
I think that motor was only offered as a 20" inch shaft length.-----The confusion on long / short / extra long will never stop either.
 
timguy said:
Joe, I have always wondered, some 55 years now. That horizontal plate above the prop that separates the prop from the water surface while "on step"........isn't it properly defined as the "anti-cavitation plate"?
Click to expand...

Yes that's what's it's actually called Tim due to its true purpose. However, somewhere along the route of the past 50 years or so, it got quoted on so often by upper echelons during seminars as the cavitation plate that it seemed to take hold... and there you have it. We people (ones in the trade) knew what it was, what it did, and there was only one to an engine. I think we're stuck with the abbreviation. :)
 
Excellent, gentlemen, thanks. I am of the "old school", and not letting my "schooling interfere with my education"........I guess it will always be the "anti-cavitation" plate to me.
 
timguy said:
Excellent, gentlemen, thanks. I am of the "old school", and not letting my "schooling interfere with my education"........I guess it will always be the "anti-cavitation" plate to me.
Click to expand...

That's okay Tim... BUT... if you ever revert back to calling these engine's kickers, I'm gonna be pretty upset! :cool:
 
Ha! "Kicker"!......"Whatever"!......"Unfortunately"!......AAAGH!
I prefer the .030 gap, Champions for sure.
 
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