Make sure the battery is well charged as plowing/winching does tend to drain the battery down.. the 800 doesn't have carbs its efi. Does it actually crank? but like the others said sort out the very basics first and then look for the more complicated issues but I do suspect it might be the battery

 

ok the battery is full charge. try to put gas in the cylinder did not fire.umm put gas in the cab. when turning it over still nuthing.still need sum help. going in the shop if not running by sat.

 

Did you make sure that the handlebar switch is on? It has happened to me and a few others.

 

It seems to be no spark. If you poured gas in cylinder and it turned over quickly then there must be an ignition problem (kill switch failure)
Check you crank and cam sensor connections.

 

ok the kill switch is working a far asi can tell shut the hole quad off when it is off .still need help