Yamaha XJ 400Z (1983) vs Ducati 250 Mark 3D Desmo (1970)
Comparison technical specifications
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| Make: | Yamaha | Ducati |
| Model: | XJ 400Z | 250 Mark 3D Desmo |
| Years: | 1983 | 1970 |
| Engine: | Four stroke, transverse four cylinder, DOHC, four valve per cylinder | Four stroke, single cylinder, Desmo SOHC, bevel gear driven |
| Capacity: | 399 cc | 248.6 cc / 15.2 cu in |
| Bore x Stroke: | 54 х 53.6 mm | 74 x 57.8 mm |
| Cooling System: | Liquid cooled | Air cooled |
| Compression Ratio: | 10.5:1 | 10.0:1 |
| Induction: | Carburator | Dell'Orto SS1 29D carburetor |
| Ignition: | Transistorized CDI | Coil, 6V 30W generator (later 6V 70 W) |
| Starting: | Electric | Kick |
| Max Power: | 55 hp / 41kW @ 11500 rpm | 16.4 kW / 22 hp @ 7500 rpm |
| Transmission: | 6 speed | 5 Speed |
| Final Drive: | Chain | Chain |
| Front Suspension: | Telescopic forks | Hydraulic fork, Ducati 31.5 mm |
| Rear Suspension: | Monocross, link type | Swingarm, Marzocchi dual shocks, 3-way adjustable |
| Front Brakes: | 2x discs | 180mm Drum |
| Rear Brakes: | Single disc | 160mm Drum |
| Front Tyre: | 90/90-18 | 2.75-18 |
| Rear Tyre: | 110/90-18 | 3.00-18 |
| Wheelbase: | 1420 mm / 55.9 in | 1360 mm / 53.5 in |
| Dry Weight: | 177 kg / 390.2 lbs | 127 kg / 280 lbs |
| Fuel Capacity: | 19 Litres / 5.0 US gal | 13 L / 3.4 US gal / 2.9 Imp gal |