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What spark plug is everyone using 08 crf250r?

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Parts Pit Stop microfiche lists either an NGK 8 or 9 heat range plugs for that application,

the CRis one heat range hotter than recommended. (NGK codes = the higher the number, the cooler the heat range)

 

Inspect it closely with a magnifying glass under a light for signs of pre-ignition,

like 'fusion' between the center electrode and insulator and/or tiny shiny metallic specks embedded in the surfaces.

 

Using that #7 plug under heavy engine load, running bad fuel (low octane) or with lean carb settings, could be very problematic.

Edited by mlatour

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