JOBU JUNIOR.

MANUFACTURED BY: JO-BU A/S MEKANISKE VERKSTED DROBAK, NORWAY SERIES OR ASSEMBLY NUMBER: YEAR INTRODUCED: 1952 YEAR DISCONTINUED: ENGINE DISPLACEMENT: 76ccm (4.63 cu. in.) NUMBER OF CYLINDERS: 1 CYLINDER BORE: PISTON STROKE: 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: CHAIN BRAKE: 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)