Yamaha XJ 400Z-S (1983) vs Yamaha DT 125MX (1981) vs Harris Rayner Ducati () vs Yamaha XT 400 (1981-85)
Comparison technical specifications
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| Make: | Yamaha | Yamaha | Harris | Yamaha |
| Model: | XJ 400Z-S | DT 125MX | Rayner Ducati | XT 400 |
| Years: | 1983 | 1981 | 1981-85 | |
| Engine: | Four stroke, transverse four cylinder, DOHC, four valve per cylinder | Two stroke, single cylinder, reed-valve | Four stroke, 90°“L”twin cylinder, SOHC, desmodromic 2 valve per cylinder. | Four stroke, single cylinder, SOHC, 4 valve |
| Capacity: | 399 cc | 123 cc / 7.5 cu-in | 642 | 399 cc / 24.3 cu-in |
| Bore x Stroke: | 54 Ñ… 53.6 mm | 56 х 50 mm | 84 x 58 mm | 87 х 67.2 mm |
| Cooling System: | Liquid cooled | Air cooled | Air cooled | Air cooled |
| Compression Ratio: | 10.5:1 | 7.2:1 | 10.5:1 | 8.8:1 |
| Induction: | Carburator | Single 24 mm Mikuni | 2x 36mm Dell'Orto PHM carbs | Caburetor |
| Ignition: | Transistorized CDI | Flywheel Magneto | Bosch PTZ Electronic | CDI |
| Starting: | Electric | Kick | Electric | Kick |
| Transmission: | 6 speed | 6 speed | 5 Speed | 5 Speed |
| Final Drive: | Chain | Chain | Chain | Chain |
| Front Suspension: | Telescopic forks | Telescopic Forks | Telescopic front fork. Pivoted | Telescopic forks |
| Rear Suspension: | Monocross, link type | Monocross | Cantilever fork with De Carbon unit. | Mono-cross |
| Front Brakes: | 2x discs | Drum | 2x 254 mm discs | Drum |
| Rear Brakes: | Single disc | Drum | Single 254 mm disc | Drum |
| Front Tyre: | 90/90-18 | 2.75-21 | 4.10 x 18 | 3.00-21 |
| Rear Tyre: | 110/90-18 | 3.50-18 | 4.25 x 18 | 4.60-18 |
| Fuel Capacity: | 19 Litres / 5.0 US gal | 7 Litres / 1.58 gal | 16 7 Litres | 11.4 Litres / 3.0 US gal |