Join Date: Nov 2009
Location: Lander, Wyoming
If a chain can slip over the sprocket teeth the sprocket has No Teeth left, IMO.
Just nubs left and someone has tightened all of the slack out which terminates suspension travel and will soon terminate other things. Possibly your Life!
I have recently viewed a pic of a Gen2 (2008 & up) which the Output shaft splines are worn out. Therefore the transmission shaft is spinning inside of the sprocket.
There is possible good reason the factory recommends 72 ft lbs torque on that nut, they may have lessened the temper on those splines since Gen1.
Modify at "YOUR OWN RISK"!
Still riding my 1987 KL650-A1. 85,000+ miles & counting