Briggs and Stratton 5.5 horsepower lawnmower engine. Shares similarities to the Briggs and Stratton 675 Series (https://www.ifixit.com/Device/Briggs_and_Stratton_675_Series_Repair)
Alternator
Carburetor Disassembly
Engine Brake Disassembly
Engine Cover
The fasteners on this engine use imperial socket sizes (i.e., 5/16, 3/8, 15/16, etc)