Junak WB1/WB3
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| Junak WB1/WB3 | |
| Manufacturer | |
|---|---|
| Production | 8500 |
| Engine | Four stroke, single cylinder, OHV |
| Compression ratio | 7.0:1 |
| Top Speed | 85 km/h / 52.8 mph |
| Ignition | Magneto |
| Battery | 14 Ah, 6V |
| Transmission | Four-speed constant-mesh |
| Frame | Double, cradle-type, welded throughout of tubing, provided with holders for side car mounting. |
| Suspension | Front: Fork with coil springs telescopic shock absorbers Rear: Independent rear wheel suspension on single wishbone , cooperating with 7- leaf spring positioned transversely; |
| Brakes | Front: Full hub width, of expander shoe type, hand operated Rear: Full hub width, of expander shoe type, foot operated |
| Front Tire | 19 in |
| Rear Tire | 12 in |
| Seat Height | 755 mm / 29.7 in |
| Weight | |
| Fuel Capacity | 17 l / 3.9 US gal |
| Manuals | Service Manual |
It could reach a top speed of 85 km/h / 52.8 mph.
Engine[edit | edit source]
The engine was a Air/Oil cooled cooled Four stroke, single cylinder, OHV. The engine featured a 7.0:1 compression ratio.
Drive[edit | edit source]
Power was moderated via the Multi-plate clutch with cork inserts working in an oil bath.
Chassis[edit | edit source]
It came with a 19 in front tire and a 12 in rear tire. Stopping was achieved via Full hub width, of expander shoe type, hand operated in the front and a Full hub width, of expander shoe type, foot operated in the rear. The front suspension was a Fork with coil springs telescopic shock absorbers while the rear was equipped with a Independent rear wheel suspension on single wishbone , cooperating with 7- leaf spring positioned transversely;. The WB1/WB3 was fitted with a 17 l / 3.9 US gal fuel tank.
Photos[edit | edit source]
Overview[edit | edit source]
Junak WB1/WB3
Szczecin Motorcycle Factory developed and started to produce in 1959 a M07 with
passenger side loader , branded as the WB1 and was later followed by the WB3. In
essence these two motorcycles are the same - the WB1 is based on the M07 and the
WB2 on the later model M10.
Passenger carrier arrangement
The sidecar, made of steel , was equipped with a windshield of perspex.
The frame of welded steel tubes suitable for four-point connection to the
motorcycle, equipped with two ball joints and two tubular struts .
Castor
spoked rim size 1.85x19 . " Tubed tires with dimensions 350x19 " .
The sidecar, made of steel suspended for rotation in the front part of the frame and on the back of the two stretched rubber rings .
Seat covered with vinyl, and was equipped with a reclining backrest , and housed a luggage bay . The sides were equipped with soft armrests. A sheet black canvas covered the sidecar.
| Make Model | Junak WB1/WB3 |
|---|---|
| Year | 1959 - 65 |
| Production | 8500 |
| Engine Type | Four stroke, single cylinder, OHV |
| Displacement | 349 cc / 21.3 cub. in. |
| Bore X Stroke | 75 x 79 mm |
| Compression | 7.0:1 |
| Cooling System | 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 Tire | 19 in |
| Rear Tire | 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 Świat motocykli 2003. |