MANUFACTURED BY: |  | JO-BU A/S MEKANISKE VERKSTED |
 | | DROBAK, NORWAY |
SERIES OR ASSEMBLY NUMBER: | | |
SERIAL NUMBER PREFIX: | | |
YEAR INTRODUCED: | | 1967 |
YEAR DISCONTINUED: | | |
ENGINE DISPLACEMENT: | | 69 ccm (4.2 cu. in.) |
NUMBER OF CYLINDERS: | | 1 |
CYLINDER BORE: | | 50mm (1.96 in.) |
PISTON STROKE: | | 35mm (1.37 in.) |
PISTON RING THICKNESS: | | |
CYLINDER TYPE: | | |
INTAKE METHOD: | | |
MANUFACTURER ADVERTISED H.P.: | | 4 hp @ 7,000 rpm |
WEIGHT: | | 8.5 kg with 40cm bar
(18.7 lbs with 15 in. bar) |
OPERATOR CONFIGURATION: | | One Man operation |
HANDLEBAR SYSTEM: | | Rigid |
CHAIN BRAKE: | | none |
CLUTCH: | | Centrifugal |
DRIVE TYPE: | | Direct |
CONSTRUCTION: | | |
MAGNETO TYPE: | | Bosch |
CARBURETOR: | | Tillotson HS-51A series |
MAJOR REPAIR KIT: | | RK-23HS |
MINOR REPAIR KIT: | | DG-5HS/T |
AIR FILTER SYSTEM: | | |
STARTER TYPE: | | |
OIL PUMP: | | Automatic, flow synchronized with throttle, adjustable |
MAXIMUM ENGINE RPM: | | 7,500 |
IDLE RPM: | | |
IGNITION TIMING: | | |
BREAKER POINT SETTING: | | |
FLYWHEEL/COIL AIR GAP: | | |
SPARK PLUG TYPE: | | |
SPARK PLUG GAP: | | |
CRANKSHAFT MAIN BEARINGS: | | |
FUEL TANK CAPACITY: | | 1.25 litres |
FUEL OIL RATIO: | | 20:1 |
RECOMMENDED FUEL OCTANE: | | |
MIX OIL SPECIFICATION: | | |
CHAIN PITCH: | | 3/8 in. or .404 in. |
CHAIN TYPE: | | |
BAR MOUNT PATTERN: | | |
SHORTEST GUIDE BAR SUPPLIED: | | 40cm (16 in.) |
LONGEST GUIDE BAR SUPPLIED: | | 60 cm (24 in.) |
COLOUR SCHEME: | | Orange and Black |
PAINT CODES: | | |
ILLUSTRATED PARTS LIST: | | |
SERVICE MANUAL: | | |