Model: 7-55

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MANUFACTURED BY: McCULLOCH MOTORS CORP.
LOS ANGELES, CALIFORNIA, U.S.A.
SERIES OR ASSEMBLY NUMBER:
YEAR INTRODUCED: 1951
YEAR DISCONTINUED: 1954
ENGINE DISPLACEMENT: 9.82 cu. in. (161cc)
NUMBER OF CYLINDERS: 1
CYLINDER BORE: 2.50 in. (63.5mm)
PISTON STROKE: 2.00 in. (50.8mm)
CYLINDER TYPE: Aluminum with cast iron sleeve
INTAKE METHOD: Rotary vavle
MANUFACTURER ADVERTISED H.P.: 7
WEIGHT : 55 lbs. (25 kg) powerhead only
OPERATOR CONFIGURATION: Two Man and One Man operation
HANDLEBAR SYSTEM: Rigid
CHAIN BRAKE: none
CLUTCH: Centrifugal
DRIVE TYPE: Bevel gear transmission
CONSTRUCTION: Die cast magnesium
MAGNETO TYPE: McCulloch
CARBURETOR: McCulloch diaphragm type
MAJOR REPAIR KIT: nla
MINOR REPAIR KIT: nla
AIR FILTER SYSTEM: Wire screen
STARTER TYPE: McCulloch automatic rewind
OIL PUMP: Manual
OPERATING RPM:
IGNITION TIMING: fixed
BREAKER POINT SETTING: 0.018 in. `
FLYWHEEL/COIL AIR GAP: 0.008 to 0.012 in. (0.2 to 0.3 mm)
SPARK PLUG TYPE: Champion J8J
SPARK PLUG GAP: 0.020 in. (0.51 mm)
CRANKSHAFT MAIN BEARINGS: Ball
FUEL TANK CAPACITY:
FUEL OIL RATIO: 1/2 pint to 1 gallon = 16:1
RECOMMENDED FUEL OCTANE: Regular grade
MIX OIL SPECIFICATION: SAE 30 non detergent or McCulloch two-cycle chain saw mix
CHAIN PITCH: 3/4 in.
CHAIN TYPE: McCulloch
BAR MOUNT PATTERN:
SHORTEST GUIDE BAR SUPPLIED: 20 in.
LONGEST GUIDE BAR SUPPLIED: 60 in.
COLOUR SCHEME: McCulloch Yellow enamel