Had to cut grass today, half choked the engine and it started and I cut 3 acres. I was WOT and turned off the PTO and then noticed flames coming from the tail pipe. Shut off the mower and noticed the choke was still at half choke. Tried to start it 4 times and every time it turned over flame would shoot out of the tail pipe. The 5th try it started and it ran great. I'm thinking with the choke open it must have dumped gas into the muffler??? I saw no damage to the mower or engine and it still runs awesome....should I have any concerns other me being a bit wit???