I am in the process of attempting to align the steering on my 1966 triumph Bonneville. When I checked the rear wheel alignment I discovered I am out of room at the rear wheel chain adjuster and the wheel appears to be cocked. I have owned the bike for 50 years and don't remember ever changing the final drive chain. I would not even know how to tell if it is worn out. Any suggestions on what type of chain I would need? There seems to be several different type and sizes available. The only markings I have found on the chain currently installed is "KCM50". not sure what this means if anything. I have thought about removing a link to shorten the chain I have now? How does one go about changing a rear chain with out removing the primary cover or is that the simplest method?