rototiller pullstart won't pull
it's a year old rear tine Yard Machines.
Kohler engine. Was fine 'til I turned it on it's right side for about 5 minutes to remove vines from tines. I noticed it was leaking oil/gas from the carburator after I turned it back upright. I tried to pull the rope to start it, it wouldn't pull at all, like it was locked up. I took the plug out and cleaned it, and put it back. It was the same. I took the plug out and pulled, it would turn over. The plug, however, was ever so slightly cross threaded. Put it back in and it locked up again. I checked the oil and gas levels and re-filled both. I waited a few days and tried again. Nothing changed. What could be wrong? Thanks for ANY help!