I just fitted a new chain and sprockets at 13,700 miles. Same thing, chain was kinking but wasn't completely worn out but I was reaplacing collapsed carrier bearing so replaced chain and cush drive and stripped the rear linkage all at the same time. I use a Scottoiler and the bike spends about 70% of it's life on trails so maintence is more regular and dedicated. I fitted the DID Extreme ( gold chain ) which is about two grades above o/e.

__________________
Touratech big guard. Yamaha handlebar guards. Pivot Pegz. Yam main stand. Camel Toe. 30 mm risers. 14 tooth front sprocket. Big balls. Old and not wise.