Yamaha RD 250 (1975) vs Yamaha FZ-S 1000 Fazer (2001) vs Kawasaki Z 250LTD (1988-) vs Yamaha XS 650 / TX 650 (1973)
Comparison technical specifications
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| Make: | Yamaha | Yamaha | Kawasaki | Yamaha |
| Model: | RD 250 | FZ-S 1000 Fazer | Z 250LTD | XS 650 / TX 650 |
| Years: | 1975 | 2001 | 1988- | 1973 |
| Engine: | Two stroke, torque induction, parallel twin | Four stroke, transverse four cylinder, DOHC, 5 valves per cylinder. | Four stroke, single cylinder, SOHC, 2 valve per cylinder | Four stroke, parallel twin cylinder, SOHC, 2 valves per cylinder. |
| Capacity: | 247 cc / 15.0 cu-in | 998 cc / 60.9 cu-in | 248 cc / 15.1 cu-in | 653 cc / 39.8 cu in |
| Bore x Stroke: | 54 х 54 mm | 74 X 58 mm | 70 x 64.mm | 75 x 74 mm |
| Cooling System: | Air cooled | Liquid cooled, | Air cooled | Air cooled |
| Compression Ratio: | 6.7:1 | 11.8:1 | 8.9:1 | 8.4:1 |
| Induction: | 2x Mikuni VM28 SC carburetor | 4 x 37mm Mikuni CV Side draft | Carburetor | 2 x Mikuni BS38 carburetors |
| Ignition: | Battery and coil with breaker points | Digital TCI | CDI | Battery, induction coil |
| Starting: | Kick | Electric | Electric | Kick |
| Max Power: | 30 hp / 22.3 kW @ 7500 rpm | 143.1 hp / 104.3 kW @ 10000 rpm | 27 hp / 20.1 kW@ 10000 rpm | 39.5 kW / 53 hp @ 7200 rpm |
| Max Torque: | 21 lb-ft / 2.9 kgf-m @ 7000 rpm | 105.9 Nm / 78.1 ft.lbs @ 7500 rpm | 21 kgf-m @ 8500 rpm | 54 Nm / 5.5 kgf-m / 39.8 lb-ft @ 6800 rpm |
| Transmission: | 6 Speed | 6 Speed | 5 Speed | 5 Speed |
| Final Drive: | Chain | Chain | Chain | Chain |
| Front Suspension: | Telescopic forks | Telescopic fork, 43mm tubes | Telescopic forks | Telescopic forks |
| Rear Suspension: | Dual shocks | Link-type swingarm | Dual shocks | Dual shock absorbers |
| Front Brakes: | Single disc | 2x 298mm discs 4 pistons calipers | Single disc | Single disc |
| Rear Brakes: | Drum | Single 268mm disc 2 piston caliper | Drum | Drum |
| Front Tyre: | 3.00S-18-4PR | 120/70 ZR17 | 90/90-19 | 3.50-19 |
| Rear Tyre: | 3.50S-18-4PR | 180/55 ZR17 | 120/90-16 | 4.00-18 |
| Fuel Capacity: | 16.5 Liters / 4.2 US gal | 21 Litres / 4.7 gal | 12 Litres / 3.1 US gal | 12.5 Litres / 3.3 US gal |