The shaft that the drive sprocket is on is hollow, whenever you took the cover off that the clutch arm is in, you seen the shaft/bucking bar, as sublunacy has said, put a good dab of thick grease all over the ball, put it back inside the hollow shaft, put some thick grease all over the bucking bar, slide it in behind the 8mm ball bearing, then make sure there a good dab of grease where the clutch arm contacts the bucking bar and then bolt the cover back on and bingo.....you got-er-done..!
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