If the crankcase filled with fun,l and you attempted to start it...good chance you good either bent a rod, or the crank went out. Should of immediately stopped and pulled the plugs as soon as any unusual resistance was felt, especially a motor with a hydraulic lock. I'll aways make sure the fuel petcock is in off mode when storing the sled or even overnight for that matter. Good to pull the plugs after storage just to loosen up the motor before attempting to start it anyways....its what i do after breaking recoil ropes.You know when I pulled it out of storage one of the needle was stuck and filled crank with fuel. I did try to start but it never really fired or back fired cause I seen gas coming out of y pipe and knew what was up and went to the carbs. Well maybe I just head to the bench with the motor and start at ground zero. Damn Really dont feel that's it but never know till ya go there. T Y for advise.