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Model: Redhead

MANUFACTURED BY:
PM (Power Machinery Ltd.)
VANCOUVER, BRITISH COLUMBIA, CANADA
SERIES OR ASSEMBLY NUMBER:
YEAR INTRODUCED:
1950
YEAR DISCONTINUED:
ENGINE DISPLACEMENT:
NUMBER OF CYLINDERS:
1
CYLINDER BORE:
2.250 in (57mm) up to serial 3WR-3599
2.4375 in. (62mm) after serial 3WR-3600
PISTON STROKE:
2.0 in. 50.8mm)
PISTON RING THICKNESS:
CYLINDER TYPE:
Chrome plated aluminum
INTAKE METHOD:
Reed valves (2)
MANUFACTURER ADVERTISED H.P.:
5 @ 3,800 rpm
WEIGHT:
35.5 lbs. with 20 in. bar & chain
16 kg with 50 cm bar & chain
OPERATOR CONFIGURATION:
One man or two man operation
HANDLEBAR SYSTEM:
Rigid
CHAIN BRAKE:
none
CLUTCH:
Centrifugal
DRIVE TYPE:
Bevel gear transmission
CONSTRUCTION:
Sand cast magnesium
MAGNETO TYPE:
Wico FWS-18 used up to serial WR1599
Wico FW-2146 used thereafter
CARBURETOR:
Tillotson MD-44A
MAJOR REPAIR KIT:
nla
MINOR REPAIR KIT:
nla
AIR FILTER SYSTEM:
Shredded metal (copper mesh) and brass screen
STARTER TYPE:
Automatic rewind
OIL PUMP:
Manual pump
MAXIMUM ENGINE RPM:
3800
IDLE RPM:
IGNITION TIMING:
BREAKER POINT SETTING:
.020 in. (0.51 mm)
FLYWHEEL/COIL AIR GAP:
Position is fixed
SPARK PLUG TYPE:
Champion J8 (PM # 10252)
SPARK PLUG GAP:
.025 in. (0.63 mm)
CRANKSHAFT MAIN BEARINGS:
Ball
FUEL TANK CAPACITY:
1-1/2 Imperial Quarts
FUEL OIL RATIO:
1 pint to 1 gallon Imperial measure
RECOMMENDED FUEL OCTANE:
Regular
MIX OIL SPECIFICATION:
SAE 40 or SAE 50
CHAIN PITCH:
9/16 in.
CHAIN TYPE:
PM with COX design cutter
BAR MOUNT PATTERN:
SHORTEST GUIDE BAR SUPPLIED:
14 in. (35.5cm)
LONGEST GUIDE BAR SUPPLIED:
60 in. (152cm)
COLOUR SCHEME:
Red wrinkle finish enamel
PAINT CODES:
ILLUSTRATED PARTS LIST:
SERVICE MANUAL:

COMMENTS:
Redhead Heavy Duty model introduced at serial number 3WR-3600, features heavy duty gear housing and 2-7/16 in cylinder bore and was advertised at 7 hp.



one man handlebars
two man handlebars
RESTORED BY BUNKER KILLAM, SAW IN SON RANCH LOGGING MUSEUM
 

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