Used Tecumseh 318cc engine model # HMSK85-155902A from Yard Machine 2 stage snowblower-DUAL SHAFT. Good engine, runs with gas sprayed into carb- will need tune up. Crankshaft is 3 3/8″ long and is stepped, first 1 5/8″ is 1 1/4″ wide, next 1/2″ is 1″ wide and end is 7/8″ and is keyed and tapped. Reverse shaft is 1″ long and the end is squared off 1/2″ wide. Engine has NO OIL, NO OIL, NO OIL.