I inherited a 2007 honda recon. It had been sitting for a few years so I replaced the carb on it. After I got the carb tuned up and ready to go I put the air cleaning housing back on. I went to crank it and it was running ok for about a minute. I went to cut the switch off and it stayed running. I yanked the battery out and it was still running and starting to get really hot. In a panic, I ripped out the spark plug and it finally died. Any idea what could have caused this? Honestly afraid to crank it up again until I figure what went wrong.