MANUFACTURED BY: McCULLOCH MOTORS CORP. LOS ANGELES, CALIFORNIA, U.S.A. SERIES OR ASSEMBLY NUMBER: YEAR INTRODUCED: 1950 YEAR DISCONTINUED: 1953 ENGINE DISPLACEMENT: 4.71 cu. in. (77 cc) NUMBER OF CYLINDERS: 1 CYLINDER BORE: 2.00 in. (50.8 mm) PISTON STROKE: 1.50 in. (38 mm) CYLINDER TYPE: Aluminum with cast iron sleeve INTAKE METHOD: Rotary valve MANUFACTURER ADVERTISED H.P.: 3 @ 4500 rpm WEIGHT : 25 lbs. (11.34 kg) with 18 in. (45 cm) bar & chain OPERATOR CONFIGURATION: One Man operation HANDLEBAR SYSTEM: Rigid CHAIN BRAKE: none CLUTCH: Centifugal DRIVE TYPE: Gear reduction CONSTRUCTION: Die cast magnesium MAGNETO TYPE: McCulloch flywheel type CARBURETOR: Mcculloch diaphragm type MAJOR REPAIR KIT: nla MINOR REPAIR KIT: nla AIR FILTER SYSTEM: Wire screen element STARTER TYPE: McCulloch kickproof automatic rewind with steel cable OIL PUMP: Manual OPERATING RPM: 4,500 IGNITION TIMING: fixed BREAKER POINT SETTING: 0.018 in. (0.45 mm) FLYWHEEL/COIL AIR GAP: 0.006 to 0.012 in. (0.15 to 0.3 mm) SPARK PLUG TYPE: Champion J8J SPARK PLUG GAP: 0.020 in. (0.51 mm) CRANKSHAFT MAIN BEARINGS: Ball and rolle types FUEL TANK CAPACITY: FUEL OIL RATIO: 1/2 pint to 1 gallon = 16:1 RECOMMENDED FUEL OCTANE: Regualr MIX OIL SPECIFICATION: SAE 30 CHAIN PITCH: 1/2 in. CHAIN TYPE: McCulloch BAR MOUNT PATTERN: SHORTEST GUIDE BAR SUPPLIED: 18 in. (45 cm) LONGEST GUIDE BAR SUPPLIED: 30 in. (76 cm) COLOUR SCHEME: McCulloch Yellow enamel