Recently I started noticing that when I snap the throttle in 1st, 2nd, or 3rd at around 4k rpm and up, it feels like the clutch is not grabbing. It sounds like the rear tire is lighting up, but that's not happening. When I crack the throttle, the revs jump up but the bike doesn't take off. The revs then come down slightly and then it seems normal. Like on a dirt-bike, when you snap the throttle, the rear tire takes off spinning and the revs jump way up, and then the tire hooks up and the revs come back down. I hope this description is somewhat accurate. Any help? If this is the clutch, how easy or difficult is it to replace?? I am somewhat mechanically inclined and am not totally afraid to tackle the job, but I'm in need of some outside input.