MALL 1 MG:ASSEMBLY NUMBER: 43120 YEAR INTRODUCED: 1953 YEAR DISCONTINUED: 1957 DISPLACEMENT: 5.0 cu. in., (82 cc) CYLINDER BORE: 2.06 in., (52 mm) PISTON STROKE: 1.50 in., (38 mm) CYLINDER TYPE: Porous Chrome Plated Aluminum INTAKE METHOD: Reed Valve ADVERTISED H.P.: 5 Brake Horsepower