Yamaha XJ 400Z-S (1983) vs Yamaha DT 125MX (1981)
Comparison technical specifications
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| Make: | Yamaha | Yamaha |
| Model: | XJ 400Z-S | DT 125MX |
| Years: | 1983 | 1981 |
| Engine: | Four stroke, transverse four cylinder, DOHC, four valve per cylinder | Two stroke, single cylinder, reed-valve |
| Capacity: | 399 cc | 123 cc / 7.5 cu-in |
| Bore x Stroke: | 54 Ñ… 53.6 mm | 56 х 50 mm |
| Cooling System: | Liquid cooled | Air cooled |
| Compression Ratio: | 10.5:1 | 7.2:1 |
| Induction: | Carburator | Single 24 mm Mikuni |
| Ignition: | Transistorized CDI | Flywheel Magneto |
| Starting: | Electric | Kick |
| Max Power: | 55 hp / 41kW @ 11500 rpm | 14 hp / 10.3 kW @ 6500 rpm |
| Max Torque: | 3.5 kgf-m / 25.3 lb-ft @ 10000 rpm | 1.5 kgf-m / 15.2 Nm @ 6500 rpm |
| Transmission: | 6 speed | 6 speed |
| Final Drive: | Chain | Chain |
| Front Suspension: | Telescopic forks | Telescopic Forks |
| Rear Suspension: | Monocross, link type | Monocross |
| Front Brakes: | 2x discs | Drum |
| Rear Brakes: | Single disc | Drum |
| Front Tyre: | 90/90-18 | 2.75-21 |
| Rear Tyre: | 110/90-18 | 3.50-18 |
| Wheelbase: | 1420 mm / 55.9 in | 1325 mm / 52.2 in |
| Dry Weight: | 179 kg / 394.6 lbs | 96 kg / 212 lbs |
| Fuel Capacity: | 19 Litres / 5.0 US gal | 7 Litres / 1.58 gal |