Correct plugs?

[GreatRiverDucker]

Can somebody tell me the correct plugs for this 15hp evinrude model#: 15904E please?

I found this champion number L78V, but champion's website says these are racing plugs?

 

[Gary H NC]

Re: Correct plugs?

Here is a great spark plug chart.
The surface gap plugs are sometimes called a racing plug..I think so they can charge you 5 bucks each..lol
http://www.boatsetup.com/SparkPlugChart.html

QL77JC4 gapped at .030 is ok per the chart too...

 

[GreatRiverDucker]

Re: Correct plugs?

Thanks Gary! Is this a '77?

 

[tashasdaddy]

Re: Correct plugs?

QL77JC4 gapped at .030

 

[GreatRiverDucker]

Re: Correct plugs?

So you don't think I should use the L87V's Tasha?

 

[HighTrim]

Re: Correct plugs?

The L78V's are surface gap plugs.

I would use the JC4's gapped to .030 as Tash said.

 

[HighTrim]

Re: Correct plugs?

and BTW it is a 1979

 

[GreatRiverDucker]

Re: Correct plugs?

I have both plugs and am gonna decarb with the old ones right now. Why should I use either one or the other?

 

[tashasdaddy]

Re: Correct plugs?

QL77JC4 gapped at .030 is what is was designed to run with.

 

[GreatRiverDucker]

Re: Correct plugs?

Thank you sir.