Ran fine this summer. Tried to start it up, but nothing happened. I checked the plug and had a spark and it was not fouled. I sprayed some starter fluid in through the airbox and it started right up. I turned a few screws on the carb to adjust the idle and then I started to smell something burning and smoke from the cylinder head area. I turned it off right away. I did look for a thread on this but did not find anything. Any advice is appreciated.