MANUFACTURED BY: WRIGHT POWER SAW & TOOL Corp. STRATFORD, CONN. U.S.A. SERIES OR ASSEMBLY NUMBER: YEAR INTRODUCED: 1957 YEAR DISCONTINUED: 1958 ENGINE DISPLACEMENT: 4.51 cu. in. (73.9 cc) NUMBER OF CYLINDERS: 1 CYLINDER BORE: 2.0 in. (50.8 mm) PISTON STROKE: 1.4375 in. (36.5 mm) CYLINDER TYPE: Aluminum with cast iron sleeve INTAKE METHOD: Reed valves MANUFACTURER ADVERTISED H.P.: not advertised WEIGHT : 19 lbs. (8.6 kg) complete OPERATOR CONFIGURATION: One Man operation HANDLEBAR SYSTEM: Rigid CHAIN BRAKE: none CLUTCH: none DRIVE TYPE: Direct CONSTRUCTION: Die cast magnesium MAGNETO TYPE: Phelon flywheel magneto CARBURETOR: Carter float type with wick elements on early version Tillotson HL-9A series on late versions MAJOR REPAIR KIT: MINOR REPAIR KIT: AIR FILTER SYSTEM: Skinner ribbon element STARTER TYPE: Fairbanks Morse automatic rewind OIL PUMP: none used OPERATING RPM: 4800 to 5200 with governor IGNITION TIMING: 0.125 in. (3.17 mm) before TDC BREAKER POINT SETTING: 0.020 in. (0.51 mm) FLYWHEEL/COIL AIR GAP: position is fixed SPARK PLUG TYPE: Champion J11J SPARK PLUG GAP: 0.025 in. (0.63 mm) CRANKSHAFT MAIN BEARINGS: Ball FUEL TANK CAPACITY: FUEL OIL RATIO: 1/2 pint to 1 gallon = 16:1 RECOMMENDED FUEL OCTANE: Regular unleaded MIX OIL SPECIFICATION: SAE 30 non detergent CHAIN PITCH: not used CHAIN TYPE: not used BAR MOUNT PATTERN: SHORTEST GUIDE BAR SUPPLIED: LONGEST GUIDE BAR SUPPLIED: 18 in. (45 cm)