Junak B20 SPECIFICATIONS, PRICE & IMAGES

Bike Features

Make Model:
Junak B20

Year:
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.