I have a 94 300 fourtrax and clutch is slipping real bad. The adjsutment screw is adjusted properly. But -- when I try to climb a hill, the engine just seems to overrev and continue to do so until I eventually end up in first or second gear. Clutch does not seem to slip in 1st or second gear, just seems to slip in 3td and 4th real bad when going up enen a slight hill . Even on flat ground when in 3td or mainly 4th gear, you can hit the gas, engine will overrev and eventually you can feel the clutch "grab". What is wrong?? Is clutch replacement hard to do --- Any help/advice appreciated....