Some Moto-X’rs feather the clutch on track, especially a cr125. When I raced two strokes, I pulled the clutch, pinned the throttle and used the clutch to accelerate through the corners (especially if their were ruts). I could burn up a clutch in a couple months on a bike, Ive yet to burn a cr125 clutch up on a kart. For the most part, the clutch is used on the starts only. Ill go months between oil changes and the oil still looks new, have never had trans failure and went 20 months on my last rebuild.