[Guest]

The bike will accelerate slowly but when I give it some gas it just revs like it isn't catching. Does that sound like the clutch?

How much does it cost to replace the clutch on one of these?

 

[PRSmechanic]

most likely the clutch plates are hard as rock, and that's why they're slipping. Or just worn out. Or the adjustment on the sprocket cover isn't done right.
It takes 1-1 1/2 hours, and I think it has 8 plates. $15-20 each. You can get cheap aftermarket ones, buyt the really cheap ones are shit.
Drop by a shop and make sure it's not the cable or cam adjustment first, before you order shit.