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Model: 3-25 (early)

MANUFACTURED BY:
McCULLOCH MOTORS CORP.
LOS ANGELES, CALIFORNIA, U.S.A.
SERIES OR ASSEMBLY NUMBER:
Type 1
YEAR INTRODUCED:
October 1949
YEAR DISCONTINUED:
March 1950
ENGINE DISPLACEMENT:
4.71 cu. in. (77cc)
NUMBER OF CYLINDERS:
1
CYLINDER BORE:
2.00 in. (50.8mm)
PISTON STROKE:
1.50 in. (38mm)
PISTON RING THICKNESS:
CYLINDER TYPE:
Aluminum chrome plated, later with cast iron sleeve
INTAKE METHOD:
Rotary valve
MANUFACTURER ADVERTISED H.P.:
3 @ 4,500 rpm
WEIGHT:
25 lbs. (11.34 kg.) with 18 in. bar & chain
OPERATOR CONFIGURATION:
One Man operation
HANDLEBAR SYSTEM:
Rigid
CHAIN BRAKE:
none
CLUTCH:
Centrifugal
DRIVE TYPE:
Gear reduction 2.69-1
CONSTRUCTION:
Die cast magnesium
MAGNETO TYPE:
McCulloch
CARBURETOR:
McCulloch all position diaphragm type
MAJOR REPAIR KIT:
nla
MINOR REPAIR KIT:
nla
AIR FILTER SYSTEM:
Wire screen
STARTER TYPE:
McCulloch Kickproof automatic rewind with steel cable
OIL PUMP:
Manual
MAXIMUM ENGINE RPM:
IDLE RPM:
IGNITION TIMING:
fixed
BREAKER POINT SETTING:
0.018 in.
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.
CRANKSHAFT MAIN BEARINGS:
Ball and roller types
FUEL TANK CAPACITY:
FUEL OIL RATIO:
1/2 pint to 1 gallon = 16:1
RECOMMENDED FUEL OCTANE:
Regular
MIX OIL SPECIFICATION:
SAE 30
CHAIN PITCH:
1/2 in.
CHAIN TYPE:
McCulloch
BAR MOUNT PATTERN:
SHORTEST GUIDE BAR SUPPLIED:
18 in. (45cm) bar with holes designed to reduce weight
LONGEST GUIDE BAR SUPPLIED:
COLOUR SCHEME:
McCulloch Yellow enamel
PAINT CODES:
ILLUSTRATED PARTS LIST:
SERVICE MANUAL:

COMMENTS:
Fuel shut-off knob located beside oiler button on rear
handle. Not many were built, hard to find.




 

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