I have Polaris Sportsman 500 H O 2011.
Yesterday I made another ride on this ATV. And i stop near home (not in the mudhole in the forest. Thank you, God!-) ) , turn off key… and my Polaris not start.
Just starter works, but not start…. after 3 or 5 sec on starter – was an explosion in the exhaust (just BOOM! ))
I take off spark-plug, and try – good spark… fuel came to carburetor and if turn out drain plug in carburetor – have gas to.

what could be the problem?

Best regards, Alexey
PS Sorry for my english