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hi guys i have a 02 scrambler 400 with a fmf exhaust system,v-force reeds with spacer,and removed air box with a k&n direct mount filter..what should i be running for jets?thanks
Your pipe maker should be able to give you a general direction to go.
I would go one spot richer on the clip and two main jets richer, run it,
do a plug check, and adjust from there.