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Which spark plug to use on 04 CRF450 + jetting help for So Cal

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Manual shows two plugs, FR8 and FR9 for "high speed riding"

Should I switch to FR9 or stock FR8 is OK? Is Supermoto considered to be high speed riding? :thumbsup: I just checked it, it's all white (very light grey) Now I know why it was popping under braking. :devil: I gues stock jetting (per manual) is not good with aftermarket exhaust and filter screen removed. Any suggestions? Thanks in advance!

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