Jawa 640 Black Style, White Style, Blue Style, Red Style (1995) vs Yamaha RD 250 (1979)
Comparison technical specifications
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| Make: | Jawa | Yamaha |
| Model: | 640 Black Style, White Style, Blue Style, Red Style | RD 250 |
| Years: | 1995 | 1979 |
| Engine: | Two stroke, parallel twin | Two stroke, torque induction, parallel twin |
| Capacity: | 343.4 cc / 21.0 cu in | 247 cc / 15.0 cu-in |
| Bore x Stroke: | 58 x 65 mm | 54 х 54 mm |
| Compression Ratio: | 9.8:1 | 6.7:1 |
| Cooling System: | Air cooled | Air cooled |
| Induction: | Jikov 28-29 CE horizontal carburetor, slide type | 2x Mikuni VM28 SC carburetor |
| Ignition: | Magneto VAPE A67 contactless | Battery and coil with breaker points |
| Starting: | Kick | Kick |
| Max Power: | 17.2 kW / 23.5 hp @ 5250 rpm | 30 hp / 22.3 kW @ 7500 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 |
| Clutch: | Multi disc in oil bath | Wet multi-plate |
| Transmission: | 4 Speed | 6 Speed |
| Final Drive: | Chain | Chain |
| Front Suspension: | Hydraulic telescopic fork, steel spiral springs | Telescopic forks |
| Rear Suspension: | Swingarm, hydraulic telescopic in suspension units, spiral springs | Dual shocks |
| Front Brakes: | Ø265 mm Disc, hydraulic control | Single 267mm disc |
| Rear Brakes: | Ø165 mm Drum, mechanical control | Single 267mm disc |
| Rear Tyre: | 2.15 B x 18" | 3.50S-18-4PR |
| Dimensions: | Length: 2100 mm / 82.7 in Width: 780 mm / 30.7 in Height: 1160 mm / 45.7 in | Length 1995 mm / 78.5 in Width 830 mm / 32.6 in Height 1085 mm / 42.7 in |
| Wheelbase: | 1370 mm / 53.9 in | 1325 mm / 52.1 in |
| Ground Clearance: | 120 mm / 4.7 in | 150 mm / 5.9 in |
| Dry Weight: | 149 kg / 328 lbs | 152 kg / 335 lbs |
| Fuel Capacity: | 17 L / 4.5 US gal | 16.5 Liters / 4.2 US gal |