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Old 09-11-2009, 10:12 AM
Bikeguy Joe Bikeguy Joe is offline
Godfather of Motorized Bicycles
Join Date: Jan 2008
Location: up north now
Posts: 11,531
Default Re: Spark plug suggestions

Hotter or colder refers to the heat range of the plug. This is how the plug transfers heat to the head to rid itself of heat. A colder plug may foul more easily, while a hotter plug can cause detonation (not likely in our engines) and other problems. Best to stay somewhere in the middle of the range for your engine.
No difference in spark generally.
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