MANUFACTURED BY: STRUNK MANUFACTURING CO. COATESVILLE, PENNSYLVANIA, U.S.A. SERIES OR ASSEMBLY NUMBER: YEAR INTRODUCED: 1955 YEAR DISCONTINUED: ENGINE DISPLACEMENT: 4.7 cu. in. (77 cc) NUMBER OF CYLINDERS: 1 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 valve MANUFACTURER ADVERTISED H.P.: 3-1/2 WEIGHT : 25 lbs. (11.3 kg) powerhead only OPERATOR CONFIGURATION: One Man operation HANDLEBAR SYSTEM: Rigid CHAIN BRAKE: none CLUTCH: Centrifugal DRIVE TYPE: Direct CONSTRUCTION: Sand cast aluminum MAGNETO TYPE: Wico FW2288 CARBURETOR: Tillotson HP-12A MAJOR REPAIR KIT: MINOR REPAIR KIT: AIR FILTER SYSTEM: Skinner ribbon element STARTER TYPE: Fairbanks Morse automatic rewind OIL PUMP: Automatic pressurized system with manual override OPERATING RPM: 4,500 IGNITION TIMING: 0.175 in. (4.44 mm) before TDC BREAKER POINT SETTING: 0.020 in. (0.51 mm) FLYWHEEL/COIL AIR GAP: Position is fixed SPARK PLUG TYPE: Champion J8J, Autolite A7X, AC M45 SPARK PLUG GAP: 0.030 in. (0.76 mm) CRANKSHAFT MAIN BEARINGS: Ball FUEL TANK CAPACITY: 48 fl. oz. (1.419 litres) FUEL OIL RATIO: 1/2 pint to 1 gallon = 16:1 RECOMMENDED FUEL OCTANE: Regular grade 72 to 83 MIX OIL SPECIFICATION: SAE 30 motor oil CHAIN PITCH: 1/2 in., .050 gauge CHAIN TYPE: BAR MOUNT PATTERN: SHORTEST GUIDE BAR SUPPLIED: 16 in. (40 cm) LONGEST GUIDE BAR SUPPLIED: 19 in. (48 cm) COLOUR SCHEME: Red enamel