Join Date: Nov 2009
Location: Lander, Wyoming
I urge one and all Not to have the Transmission in gear if using air impact wrench to remove engine sprocket nut. Could result in broken internal transmission gear.
Instead place a screw driver shank between the rear sprocket teeth and the chain and roll the bike forward to jam the chain.
Every once in a while I encounter sprockets nuts which just will not give up. Only way I've found is to Quickly heat the flats of the sprocket nut with small tip on oxy/acetylene torch, being careful of the alternator wires. Using a work stand allows the wheel to turn the nut for even heating with the torch flame pointing away from the wires.
Then jam the chain and rear sprocket with screw driver shank. Smooth, Steady pull on a breaker bar with an extension handle is preferred instead of air wrench.
Modify at "YOUR OWN RISK"!
Still riding my 1987 KL650-A1. 85,000+ miles & counting