Briggs & Stratton Intek 540 cc 19.0 Gross HP Vertical Engine, 1 inch x 3-5/32 inch Crankshaft. 12V Electric Start with 9A Alternator, Oil Pump with Filter, Fuel Pump, and Muffler.
This engine replaces: 331977-0001-G1
Crankshaft Diameter 1"
Crankshaft Length 3.157"
Crankshaft End Tapped Size 7/16-20
Crankshaft Keyway Width 1/4"