I am in the process or rebuilding my 2012 sportsman 850. The bike has a whopping 1100kms (550 miles) on it. The problem I had is the pressed on timing gear on the crank slipped and the pistons hit all 8 valves. I am replacing the pistons, rings, rods, wristpins, rod and crank bearings and all valves and guides.

Has anyone else had this happen to them? If so could you please comment on year of bike and mileage that this occurred?

Please only respond if you have had the issue of timing gear slippage

Thank you in advance