The whole thing disintegrated last Tuesday after a 600 km ride. There were 18 missing teeth on the sprocket - 8 in a row and the remainder ad hoc. After thightening the chain as stiff as possible we managed to reach home over the last 100 km + at about 40 to 60 kmph. I suspect a stone got jammed between the sprocket and chain.
Didn't need a rock. That OEM chain needs to be looked at every couple of hundred miles. Once it starts to go, it goes fast. The internal bushing are breaking up and that allows the chain to "Stretch" way too much to the point the rollers are riding the top of the sprocket teeth and just ripping them off. The shearing off teeth on these bikes is fairly common. And inordinately expensive compared to just replacing the chain.
Anybody with over a couple of thousand miles on the stock chain and is planning a several hundred mile ride should consider getting a real chain before you leave. It's a pain to have to get a chain and sprockets in the middle of a trip. You will probably be OK on the sprockets if you get a new chain now! When the chain goes, as I said, it goes fast and you don't want to waste your time on the road! The shearing off teeth on these bikes is fairly common. And inordinately expensive compared to just replacing the chain. Don't let it happen to you!
Frankly, AFAIK, the Skid Masters and chains should be replaced before you get home from the shop the first time!
Bare