Technical specifications
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| Model: |
B20 |
| Years: |
1960-65 |
|
Production:
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2500
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Engine:
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Four stroke, single cylinder, OHV
|
|
Capacity:
|
349 cc / 21.3 cub. in.
|
|
Bore x Stroke:
|
75 x 79 mm
|
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Compression Ratio:
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7.0:1
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Cooling:
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Air/Oil cooled
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Lubrication:
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Dry-sump
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Ignition:
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Magneto
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Battery:
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14 Ah, 6V
|
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Dynamo:
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45 W
|
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Starting:
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Kick-start
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Clutch:
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Multi-plate clutch with cork inserts working in an oil bath
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Max Power:
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14 kW / 19 hp @ 6000 rpm
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Max Torque:
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27.5 Nm / 2.8 kgf-m / 20.3 ft-lb @3800 rpm
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Transmission:
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Four-speed constant-mesh
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Final Drive:
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Chain
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Gear ratios:
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1st 3.04 / 2nd 1.97 / 3rd 1.29 / 4th 1.00:1
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Frame:
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Double, cradle-type, welded throughout of tubing, provided with holders for side car mounting.
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Front Suspension:
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Fork with coil springs telescopic shock absorbers
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Rear Suspension:
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Independent rear wheel suspension on single wishbone , cooperating with 7- leaf spring positioned transversely;
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Front Brakes:
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Full hub width, of expander shoe type, hand operated
|
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Rear Brakes:
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Full hub width, of expander shoe type, foot operated
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Wheels:
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Wire type, with full width hubs made of light alloy, interchangeable (also with side-car wheel). Both wheels with quick-detachable spindles
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Front Tyre:
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19 in
|
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Rear Tyre:
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12 in
|
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Front Rim:
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89 mm / 3.5 in
|
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Rear Rim:
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89 mm / 3.5 in
|
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Trail:
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72 mm / 2.8 in
|
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Dimensions:
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Length: 3055 mm / 120.3 in Width: 1420 mm / 55.9 in
|
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Dimensions of Box (internal):
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Length: 1360 mm / 53.5 in Width: 1260 mm / 49.6 in Height: 300 mm / 11.8 in
|
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Rear Track:
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1100 mm / 43.3 in.
|
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Wheel Base:
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2010 mm / 79 in
|
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Seat Height:
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755 mm / 29.7 in
|
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Ground Clearance:
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170 mm / 6.7 in
|
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Wet Weight:
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320 kg / 705.5 lbs
|
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Load Capacity:
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300 kg / 661.4 lbs
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Fuel Capacity:
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17 l / 3.9 US gal
|
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Average Consumption:
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5.7 l/100 km / 17.5 km/l / 41.3 mpg
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Top Speed:
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75 km/h / 46.6 mph
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Source:
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Article by T. Tomaszewski in „Świat motocykli” 2003.
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