Junak B20 (1960-65) vs Ducati ST4S (2003-04)
Comparison technical specifications
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| Make: | Junak | Ducati |
| Model: | B20 | ST4S |
| Years: | 1960-65 | 2003-04 |
| Engine: | Four stroke, single cylinder, OHV | Four stroke, 90°“L”twin cylinder, DOHC, desmodromic 4 valve per cylinder. |
| Capacity: | 349 cc / 21.3 cub. in. | 996 cc / 60.8 cu in |
| Bore x Stroke: | 75 x 79 mm | 98 x 66 mm |
| Compression Ratio: | 7.0:1 | 11.5:1 |
| Lubrication: | Dry-sump | Wet sump |
| Ignition: | Magneto | Marelli electronic |
| Battery: | 14 Ah, 6V | 12V 10Ah |
| Starting: | Kick-start | Electric |
| Clutch: | Multi-plate clutch with cork inserts working in an oil bath | Wet multiplate with hydraulic control |
| Max Power: | 14 kW / 19 hp @ 6000 rpm | 85.3 kW / 117 hp @ 8750 rpm |
| Max Torque: | 27.5 Nm / 2.8 kgf-m / 20.3 ft-lb @3800 rpm | 98 Nm / 10 kgf-m / 72.2 ft-lb @ 7000 rpm |
| Transmission: | Four-speed constant-mesh | 6 Speed |
| Final Drive: | Chain | Chain; front sprocket 15; rear sprocket 38 |
| Frame: | Double, cradle-type, welded throughout of tubing, provided with holders for side car mounting. | Tubular steel trellis |
| Front Suspension: | Fork with coil springs telescopic shock absorbers | Showa 43 mm fully adjustable upside-down front fork with TiN surface treatment, |
| Rear Suspension: | Independent rear wheel suspension on single wishbone , cooperating with 7- leaf spring positioned transversely; | Progressive linkage with fully adjustable Öhlins monoshock with remote control preload adjustment. Aluminium swingarm |
| Front Brakes: | Full hub width, of expander shoe type, hand operated | 2x 320mm discs 4 piston calipers with abs |
| Rear Brakes: | Full hub width, of expander shoe type, foot operated | Single 245mm disc 2 piston caliper with abs |
| Front Tyre: | 19 in | 120/70 - ZR17 |
| Rear Tyre: | 12 in | 190/50 - ZR17 |
| Dimensions: | Length: 3055 mm / 120.3 in Width: 1420 mm / 55.9 in | Length 2070 mm / 81.4 in Width: 910mm / 35.8in Height 1274 mm / 50.2 in |
| Seat Height: | 755 mm / 29.7 in | 820 mm / 32.3 in |
| Fuel Capacity: | 17 l / 3.9 US gal | 21 Litres / 5.5 US gal / 4.6 Imp gal |
| Top Speed: | 75 km/h / 46.6 mph | 249 km/h / 155 mph |