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Message: [QUOTE="MN KDXer, post: 209124, member: 16126"] I'm not a plug conversion expert, but I think I recall that the RN2C is a tad colder than a B9 and the N3 is a tad colder than an B8. They aren't a straight accross equivelent. For what empirical results are worth, the kid ran heck out his bike all summer with the RN3C plugs (430/420 mains and 25/27.5 P jets; 36:1 Injex on 91 100% non-enthanol pump gas) with good plug color. The 01 RM250 might benefit from a colder plug, though, as it seems to enjoy pinging whenever the jetting isn't spot on. [/QUOTE]