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Model: SENIOR
MANUFACTURED BY:
JO-BU A/S MEKANISKE VERKSTED
DROBAK, NORWAY
SERIES OR ASSEMBLY NUMBER:
SERIAL NUMBER PREFIX:
YEAR INTRODUCED:
1948
YEAR DISCONTINUED:
ENGINE DISPLACEMENT:
125 ccm (7.62 cu. in.)
NUMBER OF CYLINDERS:
1
CYLINDER BORE:
PISTON STROKE:
PISTON RING THICKNESS:
CYLINDER TYPE:
INTAKE METHOD:
MANUFACTURER ADVERTISED H.P.:
4
WEIGHT:
17.5 kg. with 45cm bar
(38.5 lbs. with 18 in. bar)
OPERATOR CONFIGURATION:
One Man operation
HANDLEBAR SYSTEM:
CHAIN BRAKE:
CLUTCH:
DRIVE TYPE:
CONSTRUCTION:
MAGNETO TYPE:
CARBURETOR:
MAJOR REPAIR KIT:
MINOR REPAIR KIT:
AIR FILTER SYSTEM:
STARTER TYPE:
OIL PUMP:
MAXIMUM ENGINE RPM:
4000
IDLE RPM:
IGNITION TIMING:
BREAKER POINT SETTING:
FLYWHEEL/COIL AIR GAP:
SPARK PLUG TYPE:
SPARK PLUG GAP:
CRANKSHAFT MAIN BEARINGS:
FUEL TANK CAPACITY:
FUEL OIL RATIO:
RECOMMENDED FUEL OCTANE:
MIX OIL SPECIFICATION:
CHAIN PITCH:
CHAIN TYPE:
BAR MOUNT PATTERN:
SHORTEST GUIDE BAR SUPPLIED:
LONGEST GUIDE BAR SUPPLIED:
COLOUR SCHEME:
PAINT CODES:
ILLUSTRATED PARTS LIST:
SERVICE MANUAL:
COMMENTS:
ALSO SOLD AS SANKEY P51 AND AS LINER 51
Colour photographs courtesy George Blake collection
This saw used what is known as a "Straddle" type scratcher or "crosscut" chain
 

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