I have a 95 sportsman 400 4×4 2 stroke it will crank but will not start. I have cleaned the carb and replaced the plug. its getting fuel and spark. I also replaced the 2 fuses to see if that would help. I let someone test drive it and it blew all the headlights and died. Will not restart. If anyone has had this problem please help!!! It will also backfire through the tail pipe from time to time when the choke is on.