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Discussion Starter #1
Which spark plug should I use for my 02 RC51?
In the manual it should be IFR9H11 NGK in summer.(IFR8H11 in winter)

But some guys told me that maybe FR9BI-11 NGK is better.

Could any heart man share his idea for this, as my opinion, I think the one
in manual is best. But I still do not know specs of IFR9H11 NGK, it is appreciate that the specs. could be provided.

Looking forward your feedback.
 

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Where are you located? If cold weather is a issue then you might go with 8h11. But I'll let you in on a secret. I ride in 5 Celsius in spring time ( for all you Americans, that's just above freezing ) and I run the 9h11 with no issues. Here's a guide that goes into more detail. http://www.dansmc.com/sparkplugs1.htm

Hope this helps;)
 
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