tecumseh 7hp snowblower. used for an hour today. let it sit for a few hrs and ran for 5 min and died. it will only partially turn over now. i took off the pulley guard and the pulley will turn about 180 deg and stop with a clunk. i can than spin it the other way 180 deg till it clunks again. seems to turn with no effort. is it the top end or bottom end? crank bolt backed out? can i take off the cyl head and check out the piston? i am mech inclined but i have never taken apart a small gas engine. sounds bad to me.