Main Motorcycle: 2012 Bonneville T100
Join Date: Aug 2003
Location: Massachusetts, USA
Other Motorcycle: 1970 TR6R: SOLD....
Extra Motorcycle: 1999 Yamaha Virago 1100
I would not tighten the chain. You could end up with even bigger problems with sprocket and/or seal wear on the front sprocket. Anyway, if I read it right, the wear is on the upper run of the chain, which is where it is, usually, under tension; there could be a rub, I suppose, on deceleration when the upper run is looser. I'd check the chain alignment and the chain guard itself, as it may be slightly bent towards the chain.
Just the opinion of the "village idiot", that's all: Jim
The older I get, the faster I was....until lately!! (Speed IS the fountain of youth)!