Don't tear the engine down just because it smoked one time when it hadn't been ran for a month. Like the other guys said, check some simple stuff first. If it's been sitting, could be fuel (like was mentioned). More than likely it's just from sitting. RUN THAT THING!! 50 hrs in 2 years isn't very many. That motor has barely had time to seat the rings, unless the 50 hrs were HARD hours. If they were just "puttin around" or mowing a few times, they probably just haven't got seated good. Could even be stiff/stuck. Just run it. Snowblower will be a good load.
