Junak WB1/WB3 (1959-65)

Make Model: Junak WB1/WB3


Year: 1959 – 65
Production: 8500
Engine: Four stroke, single cylinder, OHV
Capacity: 349 cc / 21.3 cub. in.
Bore x Stroke: 75 x 79 mm
Compression Ratio: 7.0:1
Cooling: Air/Oil cooled
Lubrication: Dry-sump
Ignition: Magneto
Battery: 14 Ah, 6V
Dynamo: 45 W
Starting: Kick-start
Clutch: Multi-plate clutch with cork inserts working in an oil bath
Max Power: 14 kW / 19 hp @ 6000 rpm
Max Torque: 27.5 Nm / 2.8 kgf-m / 20.3 ft-lb @3800 rpm
Transmission: Four-speed constant-mesh
Final Drive: Chain
Gear ratios: 1st 3.04 / 2nd 1.97 / 3rd 1.29 / 4th 1.00:1
Frame: Double, cradle-type, welded throughout of tubing, provided with holders for side car mounting.
Front Suspension: Fork with coil springs telescopic shock absorbers
Rear Suspension: Independent rear wheel suspension on single wishbone , cooperating with 7- leaf spring positioned transversely;

Front Brakes: Full hub width, of expander shoe type, hand operated
Rear Brakes: Full hub width, of expander shoe type, foot operated
Wheels: Wire type, with full width hubs made of light alloy, interchangeable (also with side-car wheel). Both wheels with quick-detachable spindles
Front Tyre: 19 in
Rear Tyre: 12 in
Front Rim: 89 mm / 3.5 in
Rear Rim: 89 mm / 3.5 in
Trail: 72 mm / 2.8 in
Overall Dimensions: Length: 2195 mm / 86.4 in Width: 1490 mm / 58.7 in Height: 1120 mm / 44.1 in
Dimensions of Sidecar: Length: 1800 mm / 70.9 in Height: 1120 mm / 44.1 in
Rear Track: 1020 mm / 40.2 in.
Wheel Base: 2010 mm / 79 in
Seat Height: 755 mm / 29.7 in
Ground Clearance: 170 mm / 6.7 in
Wet Weight (incl sidecar): 260 kg / 573.2 lbs
Weight of Sidecar: 67 kg / 147.7 lbs
Load Capacity: 210 kg / 463 lbs
Fuel Capacity: 17 l / 3.9 US gal
Average Consumption: 5.7 l/100 km / 17.5 km/l / 41.3 mpg
Top Speed: 85 km/h / 52.8 mph

Source: Article by T. Tomaszewski in ‘Swiat motocykli 2003.


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