Kawasaki KDX 250 (1983-85) vs Yamaha YZF 1000 R1-M (2021) vs Yamaha YZF-R 125 (2021)
Comparison technical specifications
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| Make: | Kawasaki | Yamaha | Yamaha |
| Model: | KDX 250 | YZF 1000 R1-M | YZF-R 125 |
| Years: | 1983-85 | 2021 | 2021 |
| Engine: | Two stroke, single cylinder, reed valve | Four stroke, transverse four cylinder, DOHC, 4 valves per cylinder | Four stroke, single cylinder, SOHC, 4 valve |
| Capacity: | 249 cc / 15.2 cu-in | 998 cc / 60.9 cu-in | 124.7 cc / 7.6 cu-in |
| Bore x Stroke: | 70 x 64.9 mm | 79.0 x 50.9 mm | 52 x 58.6 mm |
| Cooling System: | Air cooled | Liquid cooled | Liquid cooled |
| Compression Ratio: | 8.2:1 | 13.0:1 | 11.2:1 |
| Induction: | 36mm Mikuni carburetor | Fuel Injection with YCC-T and YCC-I | Electronic fuel Injection |
| Ignition: | CDI | TCI: Transistor Controlled Ignition | TCI |
| Starting: | Kick | Electric | Electric |
| Max Power: | 33 hp / 24.6 kW @ 7000 rpm | 147.1 kW / 197 hp @ 13500 rpm | 11 kW / 14.7 hp @ 9000 rpm |
| Max Torque: | 3.5 kgf-m @ 6500 rpm | 112.4 Nm / 11.5 kg-m @ 11500 rpm | 12.4 Nm / 9 lb-ft @ 8000 rpm |
| Transmission: | 6 Speed | 6-speed wet multiplate assist and slipper clutch | 6 Speed, Constant mesh |
| Final Drive: | Chain | "O" ring chain | Chain |
| Front Suspension: | Telescopic forks | 43mm Öhlins Electronic Racing Suspension NPX fork, fully adjustable | 41mm Upside-down telescopic fork, |
| Rear Suspension: | Mono Shock | Öhlins Electronic Racing Suspension single shock, fully adjustable | Swingarm, link type suspension |
| Front Brakes: | Drum | 2x 320mm hydraulic disc, Brake Control System and ABS | Single 292mm disc |
| Rear Brakes: | Drum | Single 220mm hydraulic disc, Brake Control System and ABS | Single 230mm disc |
| Front Tyre: | 3.00-21 | 120/70ZR17 | 100/80 -17 M/C |
| Rear Tyre: | 5.10-18 | 200/55ZR17 | 130/70 -17 M/C |
| Wheelbase: | 1475 mm / 58.0 in | 1404.6 mm / 55.3 in | 1355 mm / 53.3 inc |
| Seat Height: | 935 mm / 36.8 in | 861 mm / 33.9 in | 825 mm / 32.4 in |
| Fuel Capacity: | 12.5 Litres / 3.3 US gal | 17 Liters / 4.5 US gal | 11.5 Litres / 3.0 US gal |