MANUFACTURED BY: MONARK SILVER KING CO. YEAR INTRODUCED: 1953 DISPLACEMENT: 4.7 cu. in. (77 cc) CYLINDER BORE: 2.0 in. (50.8 mm) PISTON STROKE: 1.5 in. (38 mm) CYLINDER TYPE: Aluminum with cast iron sleeve INTAKE METHOD: Reed valves ADVERTISED H.P.: 3.5