MANUFACTURED BY: |  | PM (Power Machinery Ltd.) |
 | | VANCOUVER, BRITISH COLUMBIA, CANADA |
SERIES OR ASSEMBLY NUMBER: | | |
SERIAL NUMBER PREFIX: | | |
YEAR INTRODUCED: | | 1949 |
YEAR DISCONTINUED: | | |
ENGINE DISPLACEMENT: | | 5.5 cu. in. (90 ccm) |
NUMBER OF CYLINDERS: | | 1 |
CYLINDER BORE: | | 2 in. (50.8 mm) |
PISTON STROKE: | | 1.75 in. (44.4 mm) |
PISTON RING THICKNESS: | | |
CYLINDER TYPE: | | Cast nickel grey iron |
INTAKE METHOD: | | Reed valve |
MANUFACTURER ADVERTISED H.P.: | | 4 H.P. (B.B.H.P. 2.5) |
WEIGHT: | | 36 lbs. with 20 in. bar & chain |
OPERATOR CONFIGURATION: | | One man operation |
HANDLEBAR SYSTEM: | | Rigid (clutch activated by turning either front handle) |
CHAIN BRAKE: | | none |
CLUTCH: | | Manual, dry plate type |
DRIVE TYPE: | | Roller chain reduction |
CONSTRUCTION: | | Sand cast magnesium |
MAGNETO TYPE: | | Wico FWS-18 on saws up to serial 14,999
Starting serial 15,000 Wico FW2146 |
CARBURETOR: | | Tillotson AJ-13B up to serial number 13902
Tillotson MD-44A float type from 13903 up |
MAJOR REPAIR KIT: | | nla |
MINOR REPAIR KIT: | | nla |
AIR FILTER SYSTEM: | | Brass screen |
STARTER TYPE: | | Automatic rewind with steel cable |
OIL PUMP: | | Manual |
MAXIMUM ENGINE RPM: | | 3800 |
IDLE RPM: | | |
IGNITION TIMING: | | |
BREAKER POINT SETTING: | | .018 in. to .020 in. (.45 to .5 mm) |
FLYWHEEL/COIL AIR GAP: | | fixed |
SPARK PLUG TYPE: | | Champion J-8 (PM # 10252) |
SPARK PLUG GAP: | | .025 in. (0.63 mm) |
CRANKSHAFT MAIN BEARINGS: | | Ball type |
FUEL TANK CAPACITY: | | 1 Imperial Quart, =40 oz. (1.18 litres) |
FUEL OIL RATIO: | | 1 pint of oil to 1 gallon Imperial measure |
RECOMMENDED FUEL OCTANE: | | Regular grade |
MIX OIL SPECIFICATION: | | SAE 50 |
CHAIN PITCH: | | 9/16 in. |
CHAIN TYPE: | | PM No. 3 Standard |
BAR MOUNT PATTERN: | | |
SHORTEST GUIDE BAR SUPPLIED: | | 14 in. (35.5cm) |
LONGEST GUIDE BAR SUPPLIED: | | 36 in. (91.5 cm) |
COLOUR SCHEME: | | Red wrinkle finish enamel |
PAINT CODES: | | |
ILLUSTRATED PARTS LIST: | |  PM WOODBOSS-DIPL1.pdf |
SERVICE MANUAL: | | |