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fat guy
12-22-2002, 03:17 PM
PLEASE HELP!!!!!!
2002 400ex, all stock--just got fmf powercore iv silencer--do i need to rejet my carb for this exhaust?? if so, will a k&n jet kit take care of it? seems like more air in/out should need carb changes. thanks for any info!
ny300exrider
12-22-2002, 03:18 PM
ahh i looked...yes a kn jet kit will do it...you will need to jet to get performance out of it
AtvMxRider
12-22-2002, 03:32 PM
Originally posted by ny300exrider
ahh i looked...yes a kn jet kit will do it...you will need to jet to get performance out of it

Yep what he said!
Sparks425Ex
12-22-2002, 04:03 PM
Originally posted by AtvMxRider


Yep what he said!

Yup What He Said!
RideRed04
12-22-2002, 04:04 PM
You dont need to rejet, but do it to get the most power. Do the filter at the same time. If you run a K&N, put your lid on with the front 2 clips under the lid and the back 4 holding it on (creating a gap). Put a filter skin on it so it doesnt pass dust.