riding today in fernie. everything goin good. rode up hill behind new cabin , played around for a while, all good. i get to top and shut my sled off. wait for bro in law to get up there with my spare m8. he pulls up beside me and shuts it down. no issues no backfiring or bogging. go to take off 10mins later he pulls the cord and its stuck. wont pull. i grab front clutch and turn forward and locks up. turns backward ok. turn forward again and locks up0. had to tow it out. take exhaust off and inside of ypipe is all grey colour. not black or oily like i thought would be. pistons seem to move up and down ok. untill it gets to spot where it locks up. anyone have any idea where to start? i was thinking powervalve stuck in. maybe. or bearing gone but assume it wouldnt move either way if that was the case. maybe conrod? need your thoughts.