New TECUMSEH model AV520 2 cycle engine. Built for commercial duty weed trimmers. No fuel tank. Crankshaft is straight with no keyway, no splines and no taper. The threads on the end are right-handed. Deflector style muffler. Can be used in vertical or horizontal orientation.
5.2 cu. in. Displ.
Crankshaft 0.975" dia. x 0.700" long smooth with 3/4"-10 x 0.475" long threaded end