Jawa 640 Black Style, White Style, Blue Style, Red Style (1995) vs Yamaha RD 250 (1979) vs Yamaha XS 400L Maxim (1982-)
Comparison technical specifications
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| Make: | Jawa | Yamaha | Yamaha |
| Model: | 640 Black Style, White Style, Blue Style, Red Style | RD 250 | XS 400L Maxim |
| Years: | 1995 | 1979 | 1982- |
| Engine: | Two stroke, parallel twin | Two stroke, torque induction, parallel twin | Four stroke, parallel twin, DOHC, 2 valves per cylinder |
| Capacity: | 343.4 cc / 21.0 cu in | 247 cc / 15.0 cu-in | 399 cc / 24.3 cu-in |
| Bore x Stroke: | 58 x 65 mm | 54 х 54 mm | 69.0 x 53.4 mm |
| Compression Ratio: | 9.8:1 | 6.7:1 | 9.7:1 |
| Cooling System: | Air cooled | Air cooled | Air cooled |
| Induction: | Jikov 28-29 CE horizontal carburetor, slide type | 2x Mikuni VM28 SC carburetor | 2x 32mm Mikuni carburetors |
| Ignition: | Magneto VAPE A67 contactless | Battery and coil with breaker points | Transistorized |
| Starting: | Kick | Kick | Electric |
| Max Power: | 17.2 kW / 23.5 hp @ 5250 rpm | 30 hp / 22.3 kW @ 7500 rpm | 45.5 hp / 34 kW @ 9500 rpm |
| Max Torque: | 31.4 Nm / 3.2 kgf-m / 23.2 ft.lb @ 4750 rpm | 21 lb-ft / 2.9 kgf-m @ 7000 rpm | 3.5 kgf-m / 25.3 lb-ft @ 8000 rpm |
| Clutch: | Multi disc in oil bath | Wet multi-plate | Wet, multiplate |
| Transmission: | 4 Speed | 6 Speed | 6 Speed |
| Final Drive: | Chain | Chain | Chain |
| Front Suspension: | Hydraulic telescopic fork, steel spiral springs | Telescopic forks | Hydraulic telescopic forks |
| Rear Suspension: | Swingarm, hydraulic telescopic in suspension units, spiral springs | Dual shocks | Monocross system with single coil sprung, gas/oil damped shock, pre-load adjustable |
| Front Brakes: | Ø265 mm Disc, hydraulic control | Single 267mm disc | Single 10.5 in disc |
| Rear Brakes: | Ø165 mm Drum, mechanical control | Single 267mm disc | Drum |
| Rear Tyre: | 2.15 B x 18" | 3.50S-18-4PR | 4.10-18 |
| Wheelbase: | 1370 mm / 53.9 in | 1325 mm / 52.1 in | 54.1 in |
| Ground Clearance: | 120 mm / 4.7 in | 150 mm / 5.9 in | 5.9 in |
| Dry Weight: | 149 kg / 328 lbs | 152 kg / 335 lbs | kg / 366 lbs |
| Fuel Capacity: | 17 L / 4.5 US gal | 16.5 Liters / 4.2 US gal | 17 Litres / 4.4 US gal |