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ContinuousWave: Whaler Performance
Spark plug selection: hotter or cooler?
|Author||Topic: Spark plug selection: hotter or cooler?|
posted 03-04-2003 07:45 PM ET (US)
I've always replaced the spark plugs in my 1987 40 HP Johnson with what was in there before. However, according to the dealer, it turns out there are two recommended Champion plugs indicated for this engine: Champion L82YC ("L") and Champion QL77JC4 ("Q").
It's my understanding the Q is a hotter plug, and offers more protection against fouling when idling or trolling. The L is cooler, which the dealer recommended using if you run the engine hard.
A few questions:
1) Is Q really hotter than L? Are there other substantive differences?
Has anyone seen a site that gives a good lesson on what the differences with the spark plugs mean, and how to distinguish them by their numbers? Please share your wisdom!
posted 03-05-2003 08:46 AM ET (US)
Shrimp, I used to own and race a 2 stroke yamaha streetbike. I always ran the cooler plugs because I always rode with the RPM's up high.
posted 03-05-2003 10:50 AM ET (US)
Great info on that website, Newt. Thanks.
posted 03-05-2003 02:26 PM ET (US)
That is a great website, indeed, Newt. Thanks for posting it. NGK's Australian site has even more info.
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