1998 Sportsman 500 was working fine. We use it around the farm. Started out one day as normal. I didn’t get very far and remembered I did not fuel up so returned to garage and filled up the tank. ATV will now not start. It turns over fine, but won’t fire up.

The air filter seems clean enough. I took it off to see if that would help. I covered the hole with my hand to check for vacuum. It seems strong. A little gas came back through the air box when I stopped trying to crank it and the spark plug is wet. Does that indicate it is flooded?