Join Date: Nov 2009
Location: Lander, Wyoming
It is best to Loosen the front sprocket nut while the rear axle & chain adjusters are still Tight.
You will need to slide the rear adjusters FULLY Forward to have enough chain slack to get the old sprocket off & larger one on. Then lightly snug the rear axle and evenly adjust the chain adjusters until the lower run of chain can be lifted to 'just touch' the rear tip of the rubber underslider.
Now Torque the front nut, double check the chain slack, (I then wade up a rag or slip a screwdriver between chain & rear sprocket to pull the axle Hard into the adjusters and bearings) then tighten rear axle & snug adjusters.
Modify at "YOUR OWN RISK"!
Still riding my 1987 KL650-A1. 85,000+ miles & counting