I would pull the clutch basket out and check it. Pay close attention to the one way bearing. As to it running bad I would also drain the carb. If you do not have it plugged on the bottom it will let water in and cause it to run rough.
David
2008 Polaris RZR Lifted, Laws, Springs, Spacers, Snorkles (you get the picture)
07- Grizzly 700 29.5's on SS112's
06- Yamaha Rhino "Mi Lil Donkey" (Sold_
04- Bombardier 400 "Wild Thing" Paint Scheme (SOLD)
03- Yamaha Kodiak 450. Lawed. Piped, snorkled etc...
03- Arctic Cat 250. EDLs. Pipe, lift and snorkle coming soon.
04- Kazuma 110. Piped, snorkled, lawed etc.. The baddest of them all. lol (sold)