Changed the rear tire the other day on my 954 and adjusted the slack in the chain, was a lil too loose. Went for a 30 mile ride and half way through I heard a knock, then I felt it in the pegs. Upon pulling over I noticed that any slack in the chain was pretty much gonzo. I went straight home and got the bike on the stand. Upon spinning the rear wheel, I noticed it getting hung up at one point in the rotation, and it seems to be coming from the front sprocket area.
A) Did I possibly bend the input shaft???
B) Really not sure why the chain tightened up, I've changed the tire many times.
Going to take an in depth look at it when I get home tonight.