'98 30hp Evinrude QL77JC4

Cricket Too

Lieutenant Commander
Joined
May 14, 2003
Messages
1,732
Sticker on the bracket shows QL77JC4 as the plug to use, and that's what is in it, (I just bought it). The gaps were open to over .050 so I am just going to get new plugs.

This chart shows I can use QL77JC4, L78V or QL82C. Is there any reason to try one of the other's instead of the QL77JC4? Would there be any benefit to running a QL78YC in this engine?

http://continuouswave.com/whaler/ref...gChart2008.pdf


It has a miss when at WOT, I'm hoping the gaps being open to .050 were the issue. Compression is good on it.

Thanks.
 

Daviet

Fleet Admiral
Joined
Sep 24, 2008
Messages
8,958
Re: '98 30hp Evinrude QL77JC4

Just regap the QL77JC4 plugs and see if it corrects your problem.
 
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