Tecumseh snow engines are natorious for not starting,first thing you need to do is take the old gas from the tank.gas only stays good for about 30 days.YEP .....that's all.there should be two screws that holds the cover over the carb.take the bowl off and there should be water and dirt in the bowl.clean that out,be careful not to drop the needle off the float.if you do it take a little patence to put it back on.now the nut you took off the bowl has three holes in the side of it.clean all the holes,one is really small and it's up twards the theads..replace the bowl gasket and reassemble the carb.now you should have fuel to the cylinder and it should start.if not let me know