I'd like to know the compression.
I agree the clutchs need inspected and serviced. The grease gets hard as a rock and limits the roller travel. From the rollers working in a lilited fashion, the roller hub and the plate that covers the rollers are usually grooved/wore uneven/made a big divot/etc.
At your Zuki dealer the parts including new rollers should be approx $65. If needed.
FYI: no rev limiter.
Did this happen after the pipe was installed or was it running fine at one point w/the FMF?
2000 GNC 5N\
2001 GNC 9N \ 40+ class
2004 GNC 9N /
2014 rock crusher "GO tortoise GO!"
2016 Byrd Rooster
Father of the "11" time National champion,and worlds fastest woman ATV racer
A few fast LT80's
250R~300cc's
300ex
350 Rancher
Kymco Mongoose
Survivor of the 12 Hours of ATV America 04 and 05