differennce between hot spark plug and cold spark plug - Stromtrooper Forum : Suzuki V-Strom Motorcycle Forums
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Old 11-17-2012, 09:48 PM
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Default differennce between hot spark plug and cold spark plug

A spark plug is said to be "hot" if it is a better heat insulator, keeping more heat in the tip of the spark plug. A spark plug is said to be "cold" if it can conduct more heat out of the spark plug tip and lower the tip's temperature. http://www.ngksparkplugs.ca/tech-info-spark-plugs.cfm

Last edited by JRWalker; 11-25-2012 at 08:56 AM.
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Old 11-18-2012, 12:20 PM
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And the bonus question is... How can you tell when your existing plug is too hot or too cold??
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Old 11-18-2012, 12:34 PM
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In a liquid cooled bike, heat range isn't as big a deal as on an air cooled bike. Liquid does a much better job of removing heat from the combustion chamber, allowing a wider heat range on plugs. That being said, too hot a plug will erode electrodes too fast. In extreme cases, it can cause hot spot detonation or even pre-ignition. Too cold a plug will foul as it won't burn off deposits properly.
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Old 12-23-2012, 08:22 AM
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Too hot a plug will show pitting on the ceramic central electrode and will be colored white-ish gray, too cold will burn sooty. The color to aim for is light tan/gray with the tip looking clean. Lots of color images available with a little searching. Look up NGK or Denso.

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