StormForce OHV Replacement Snow Blower Engine withElectric StartStormForce OHV Replacement Snow Blower Engine w/Electric Start. 208cc 3/4inDx2 27/64inL Shaft. Northern Tool Item# 20596. 24 months parts / 24 months labor. The StormForce OHV Replacement Snow Blower Engine is designed for fuel economy and easy starts, with a large mitten-grippable starter handle. Industrial cast iron.