Greetings all. I have an M600 that was upgraded with a 610 motor. Started it up this morning and was moving some snow when I noticed the left drive lever was suddenly loose. There was no resistance pushing forward and then it caught and went full forward and stuck. I shut the engine off and could not get the lever to move from full forward. I removed the clutch adjustment nut covers and the front one was normal, but the rear adjustment was extremely tight. I backed it off until it was loose, but still can't get the lever to go forward. Any pointers before I call the dealership and have it towed in? Thanks for any input. John