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Model: 50

MANUFACTURED BY:
JONSEREDS FABRIKERS AB
PARTILLE, SWEDEN
SERIES OR ASSEMBLY NUMBER:
YEAR INTRODUCED:
1971
YEAR DISCONTINUED:
ENGINE DISPLACEMENT:
44cc
NUMBER OF CYLINDERS:
1
CYLINDER BORE:
42mm
PISTON STROKE:
32mm
PISTON RING THICKNESS:
CYLINDER TYPE:
Aluminum with chrome plated bore
INTAKE METHOD:
Piston ported
MANUFACTURER ADVERTISED H.P.:
2.0kW @ 8000 rpm
WEIGHT:
5.97kg
OPERATOR CONFIGURATION:
One Man operation
HANDLEBAR SYSTEM:
Anti-vibration
CHAIN BRAKE:
none
CLUTCH:
Centrifugal
DRIVE TYPE:
Direct
CONSTRUCTION:
Die cast magnesium
MAGNETO TYPE:
Pagani
CARBURETOR:
Tillotson HS-21D series
MAJOR REPAIR KIT:
RK-23HS
MINOR REPAIR KIT:
DG-5HS/T
AIR FILTER SYSTEM:
Nylon mesh cartridge
STARTER TYPE:
Jonsereds automatic rewind
OIL PUMP:
Automatic, worm gear driven
MAXIMUM ENGINE RPM:
10,700
IDLE RPM:
IGNITION TIMING:
2.0mm before TDC
BREAKER POINT SETTING:
0.3 to 0.4mm
FLYWHEEL/COIL AIR GAP:
0.3 mm (0.012 in.)
SPARK PLUG TYPE:
Bosch WS7F
SPARK PLUG GAP:
0.5mm (0.020 in.)
CRANKSHAFT MAIN BEARINGS:
Caged needle roller (Torrington)
FUEL TANK CAPACITY:
800ml
FUEL OIL RATIO:
25:1
RECOMMENDED FUEL OCTANE:
Regular
MIX OIL SPECIFICATION:
Two-cycle chain saw mix oil
CHAIN PITCH:
3/8 in.
CHAIN TYPE:
BAR MOUNT PATTERN:
SHORTEST GUIDE BAR SUPPLIED:
33 cm (13 in.)
LONGEST GUIDE BAR SUPPLIED:
45 cm (18 in.)
COLOUR SCHEME:
Red and Silver enamel
PAINT CODES:
ILLUSTRATED PARTS LIST:
SERVICE MANUAL:

COMMENTS:
later version used 44 mm piston and was 49 cc displacement engine or 3.0 cu. in.

Photographs courtesy George Blake collection
 

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