On a recent piston ring replacement job at 9,900KM (due to ingress of dust) I was surprised at the lack of tension on the cam chain and when I released the two bolts found only 3 to 4mm left. upon lifting the chain at the top of the sprocket, even under tension it was a good 1.5mm. I found similar wear on another engine, also at the 10,000Km mark. The tensioner had deep wear marks on the plunger on opposite edges too.
On the GS Moon 260, (Linhai 170M) cam chains they wore out so quickly it became policy to fit new Yamaha ones from new. the original ones lasted a few weeks whereas the Yamaha ones last a good year or so.
Seems that, although much heavier and wider than the Linhai one, the Chinese still can't make a decent cam chain so Suzuki or DID replacements coming up, the tensioner also looks the same as my Suzuki AN400 Burgman one.