I was rebuilding this 2005 grizzly 660 for a friend of mine. I got it back together in time and it started and idle fine. So I finished putting all the plastics back up. I got it finished started it and rode it maybe a minute than all sudden die. It wouldn’t start back. I start tearing it apart to find this and the timing chain completely throw off. Does anyone know what causes this? It’s not stripped out.