Junak B20 (1960-65) technical specifications
Junak B20 is produced in 1960-65. Engine is Four stroke, single cylinder, OHV, displacement 349 cc / 21.3 cub. in. , produces power 14 kW / 19 hp @ 6000 rpm and 27.5 Nm / 2.8 kgf-m / 20.3 ft-lb @3800 rpm. Junak B20 top speed is 75 km/h / 46.6 mph. Junak B20 wet weight is 320 kg / 705.5 lbs. Junak B20 has 2 photos.
Technical specifications
+ Add to 'Compare list'| Model: | B20 |
| Years: | 1960-65 |
| Production: | 2500 |
| 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 |
| Dimensions: | Length: 3055 mm / 120.3 in Width: 1420 mm / 55.9 in |
| Dimensions of Box (internal): | Length: 1360 mm / 53.5 in Width: 1260 mm / 49.6 in Height: 300 mm / 11.8 in |
| Rear Track: | 1100 mm / 43.3 in. |
| Wheel Base: | 2010 mm / 79 in |
| Seat Height: | 755 mm / 29.7 in |
| Ground Clearance: | 170 mm / 6.7 in |
| Wet Weight: | 320 kg / 705.5 lbs |
| Load Capacity: | 300 kg / 661.4 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: | 75 km/h / 46.6 mph |
| Source: | Article by T. Tomaszewski in „Świat motocykli” 2003. |
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