Yamaha XJ 400Z (1983) vs Ducati 250 Mark 3D Desmo (1970) vs BMW R 90/6 (1973-76)
Comparison technical specifications
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| Make: | Yamaha | Ducati | BMW |
| Model: | XJ 400Z | 250 Mark 3D Desmo | R 90/6 |
| Years: | 1983 | 1970 | 1973-76 |
| Engine: | Four stroke, transverse four cylinder, DOHC, four valve per cylinder | Four stroke, single cylinder, Desmo SOHC, bevel gear driven | Four stroke, two cylinder horizontally opposed Boxer, pushrod operated 2 valves per cylinder. |
| Capacity: | 399 cc | 248.6 cc / 15.2 cu in | 898 cc / 54.8 cu in. |
| Bore x Stroke: | 54 х 53.6 mm | 74 x 57.8 mm | 90 x 70.6 mm |
| Cooling System: | Liquid cooled | Air cooled | Air cooled |
| Compression Ratio: | 10.5:1 | 10.0:1 | 9.0:1 |
| Induction: | Carburator | Dell'Orto SS1 29D carburetor | 2 x Bing constant depression carburetors |
| Ignition: | Transistorized CDI | Coil, 6V 30W generator (later 6V 70 W) | Battery ignition |
| Starting: | Electric | Kick | Electric |
| Max Power: | 55 hp / 41kW @ 11500 rpm | 16.4 kW / 22 hp @ 7500 rpm | 44.1 kW / 60 hp @ 6500 rpm |
| Transmission: | 6 speed | 5 Speed | 5 Speed |
| Final Drive: | Chain | Chain | Shaft |
| Front Suspension: | Telescopic forks | Hydraulic fork, Ducati 31.5 mm | Telescopic hydraulic forks. |
| Rear Suspension: | Monocross, link type | Swingarm, Marzocchi dual shocks, 3-way adjustable | Long swinging arm with adjustable strut. |
| Front Brakes: | 2x discs | 180mm Drum | Single ∅260mm disc, 1 piston caliper |
| Rear Brakes: | Single disc | 160mm Drum | 200mm Drum |
| Front Tyre: | 90/90-18 | 2.75-18 | 3.25 - H19 |
| Rear Tyre: | 110/90-18 | 3.00-18 | 4.00 - H18 |
| Wheelbase: | 1420 mm / 55.9 in | 1360 mm / 53.5 in | 1465 mm / 57.67 in |
| Fuel Capacity: | 19 Litres / 5.0 US gal | 13 L / 3.4 US gal / 2.9 Imp gal | 18 Liters / 4.75 US gal |