Join Date: Nov 2009
Location: Lander, Wyoming
I only use the "touch the rubber slider" but "not the metal", method for chain slack inspection.
All it takes is one time of adjusted Too Tight to gall the rivet pins and inner diameter of the bushings, to start the degradation of any drive chain.
Sometimes simply tightening the axle nut will shift the axle into the too tight zone.
How to prevent that?
I always Insert a rag, screwdriver bit or end wrench between the chain and the rear sprocket and roll it Tight! Then tighten the Axle nut, remove screwdriver, recheck slack, re-snug adjuster lock nuts.
Modify at "YOUR OWN RISK"!
Still riding my 1987 KL650-A1. 83,000+ miles & counting