1988 Johnson 40 hp VRO (What is the best possible spark plug?)

JohnnyRuuDe

JohnnyRuuDe

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I recently learned that JOhnson recommends the use of Champion's "QL" type spark plugs for use on all VRO models. Is this info up-to-date? Is there a superior replacement. I know they do a great deal of testing to determine the best spark plug but the specification chart I read is only current as of 2007. The guy I bought it from had regular plugs in there and said it misfired at high rpm but he wasn't sure why...hhmmm. Also, does this engine have a charging system...i'm clueless and any help would be cool. Thanks -Lewis
 
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steelespike

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Re: 1988 Johnson 40 hp VRO (What is the best possible spark plug?)

My info says Champion QL77JC4 for normal operation,QL78V for sustained high speed operation.
 
tashasdaddy

tashasdaddy

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Re: 1988 Johnson 40 hp VRO (What is the best possible spark plug?)

correct, NAPA autoparts even has a note on there computers, that anything but champions, have been known to cause missfires in Johnson/Evinrude outboards.
 
JohnnyRuuDe

JohnnyRuuDe

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Re: 1988 Johnson 40 hp VRO (What is the best possible spark plug?)

Thank you gentleman..I appreciate your help. Lewis
 
Silvertip

Silvertip

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Re: 1988 Johnson 40 hp VRO (What is the best possible spark plug?)

Yes -- the engine has a charging system.
 
JohnnyRuuDe

JohnnyRuuDe

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Re: 1988 Johnson 40 hp VRO (What is the best possible spark plug?)

Thanks Silvertip, good to know! Any Idea what kind of charging voltage I should be getting out of the engine, I'd like to check it.
 
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