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Message: [QUOTE="DLHamblin, post: 1202287, member: 61339"] Yes you are correct except its not the 8 will get to temp faster necessarily, the lower the number (7,8,9 etc); the hotter the actual running temperature of the plug (tip). Thats why a BR8EG will likely work better while learning; it (the tip) will run hotter than the BR9EG and hence self-clean from deposits that can foul it. If jetted rich that should be looked into (not familiar with KX125 to say) but while learning the hotter BR8EG will help the plugs last longer. [/QUOTE]