KTM 125 Sting (1997-99) vs Yamaha RD 125 (1977) vs Yamaha XJ 400Z-E (1983)
Comparison technical specifications
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| Make: | KTM | Yamaha | Yamaha |
| Model: | 125 Sting | RD 125 | XJ 400Z-E |
| Years: | 1997-99 | 1977 | 1983 |
| Engine: | Single cylinder two stroke | Two stroke, parallel twin | Four stroke, transverse four cylinder, DOHC, four valve per cylinder |
| Capacity: | 124.8 cc / 7.6 cu in | 124 cc / 7.6 cu-in | 399 cc |
| Bore x Stroke: | 56 x 50.7 mm | 43 х 43 mm | 54 х 53.6 mm |
| Compression Ratio: | 6.8:1 | 10.5:1 | |
| Cooling System: | Liquid cooled | Air cooled | Liquid cooled |
| Starting: | Electric | Kick | Electric |
| Max Power: | 10.1 kW / 13.5 hp @ 8400 rpm | 17 hp / 12.4 kW @ 8500 rpm | 55 hp / 41kW @ 11500 rpm |
| Max Torque: | 13.1 Nm / 1.34 kgf-m / 9.7 ft-lb @ 7500 rpm | 1.3 kgf-m @ 8000 rpm | 3.5 kgf-m / 25.3 lb-ft @ 10000 rpm |
| Transmission: | 6 Speed | 5 Speed | 6 speed |
| Final Drive: | Chain | Chain | Chain |
| Front Suspension: | 43mm Upside down forks and shock | 28 mm telescopic forks | Telescopic forks |
| Rear Suspension: | Fully adjustable White Power mono-shock | Dual rear shock pre-load adjustable | Monocross, link type |
| Front Brakes: | Single 320 mm disc | Single240mm disc | 2x discs |
| Rear Brakes: | Single 220 mm disc | 130 mm Drum | Single disc |
| Front Tyre: | 110/70-17 | 2.75-18 | 90/90-18 |
| Rear Tyre: | 130/70-17 | 3.00-18 | 110/90-18 |
| Fuel Capacity: | 8.5 L / 2.2 US gal / 1.9 Imp gal | 11.5 Litres / 3.04 US gal | 19 Litres / 5.0 US gal |