MANUFACTURED BY: |  | JO-BU A/S MEKANISKE VERKSTED |
 | | DROBAK, NORWAY |
SERIES OR ASSEMBLY NUMBER: | | |
SERIAL NUMBER PREFIX: | | |
YEAR INTRODUCED: | | 1952 |
YEAR DISCONTINUED: | | |
ENGINE DISPLACEMENT: | | 76ccm (4.63 cu. in.) |
NUMBER OF CYLINDERS: | | 1 |
CYLINDER BORE: | | |
PISTON STROKE: | | |
PISTON RING THICKNESS: | | |
CYLINDER TYPE: | | Chrome plated aluminum on later type
early type had removable cast liner |
INTAKE METHOD: | | Piston ported |
MANUFACTURER ADVERTISED H.P.: | | 2 |
WEIGHT: | | 10.4 kg with 45cm bar
(23 lbs. with 18 in. bar) |
OPERATOR CONFIGURATION: | | One Man operation |
HANDLEBAR SYSTEM: | | Rigid |
CHAIN BRAKE: | | none |
CLUTCH: | | Manual plate clutch with cork friction pieces |
DRIVE TYPE: | | Roller chain reduction |
CONSTRUCTION: | | Sand cast aluminum |
MAGNETO TYPE: | | Wico |
CARBURETOR: | | JO-BU float type |
MAJOR REPAIR KIT: | | |
MINOR REPAIR KIT: | | |
AIR FILTER SYSTEM: | | Brass wire screen |
STARTER TYPE: | | JO-BU automatic rewind |
OIL PUMP: | | Manual |
MAXIMUM ENGINE RPM: | | 4000 |
IDLE RPM: | | |
IGNITION TIMING: | | |
BREAKER POINT SETTING: | | .015 in. |
FLYWHEEL/COIL AIR GAP: | | |
SPARK PLUG TYPE: | | |
SPARK PLUG GAP: | | .015 in. |
CRANKSHAFT MAIN BEARINGS: | | Ball |
FUEL TANK CAPACITY: | | |
FUEL OIL RATIO: | | 10-1 |
RECOMMENDED FUEL OCTANE: | | Regular |
MIX OIL SPECIFICATION: | | SAE 10 in cold weather, SAE 20 or 30 in warm wather |
CHAIN PITCH: | | |
CHAIN TYPE: | | JO-BU standard (scratcher) or JO-BU chipper |
BAR MOUNT PATTERN: | | |
SHORTEST GUIDE BAR SUPPLIED: | | 18 in. (45cm) |
LONGEST GUIDE BAR SUPPLIED: | | 18 in. (45cm) |
COLOUR SCHEME: | | |
PAINT CODES: | | |
ILLUSTRATED PARTS LIST: | | |
SERVICE MANUAL: | | |