Ducati 125 Six Days (1977-78) vs Kawasaki Z 750E (1980-81) vs Kawasaki BJ 250 Estrella (2007-10) vs Triumph Street Triple 675 (2007)
Comparison technical specifications
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| Make: | Ducati | Kawasaki | Kawasaki | Triumph |
| Model: | 125 Six Days | Z 750E | BJ 250 Estrella | Street Triple 675 |
| Years: | 1977-78 | 1980-81 | 2007-10 | 2007 |
| Engine: | Two stroke, single cylinder, piston port | Four stroke, transverse four cylinder, DOHC, 2 valve per cylinder. | Four stroke, single cylinder, SOHV , 2 valves | Four stroke, in-line 3-cylinder, DOHC, 12 valve |
| Capacity: | 123.7 cc / 7.5 cu in | 738 cc / 45.0 cu-in | 249 cc / 15.2 cu-in | 675 cc / 41.19 cu-in |
| Bore x Stroke: | 54 x 54 mm | 66 х 54 mm | 66 X 63 mm | 74 x 52.3 mm |
| Compression Ratio: | 14.6:1 | 9.0:1 | 9.0:1 | 12.65:1 |
| Cooling System: | Air cooled | Air cooled | Air cooled | Liquid-cooled |
| Induction: | Dell'Orto PHBE 32 carburetor | 4x 32mm Keihin carburetors | Carburetor | Multipoint sequential electronic fuel injection with forced air induction |
| Ignition: | Motoplat electronic | CDI | CDI | Digital - inductive type |
| Max Power: | 18.38 kW / 25 hp @ 10250 rpm | 74 hp / 54 kW @ 9000 rpm | 20 hp / 14.9 kW @ 6000 rpm | 78 kW / 105 hp @ 11850rpm |
| Transmission: | 6-Speed | 5 Speed | 5 Speed | 6 Speed |
| Final Drive: | Chain | Chain | Chain | O ring chain |
| Front Suspension: | 35mm Marzocchi with magnesium forks | Telescopic hydraulic fork | Telescopic forks | 41mm Kayaba telescopic upside down forks |
| Rear Suspension: | Swinging arm with dual Marzocchi shocks | Swinging fork | Dual shocks | Kayaba monoshock, adjustable preload |
| Front Brakes: | 125 mm drum | 2x 226mm discs | Single 300mm disc | 2 x 308 mm Discs, Nissin 2 piston sliding calipers |
| Rear Brakes: | 140 mm drum | Single 226mm disc | Single 230mm disc | Single 220 mm disc, 1 piston caliper |
| Front Tyre: | 3.00 x 21 | 3.25H-19 | 90/90-18 51 P | 120/70 ZR 17 |
| Rear Tyre: | 4.00 x 18 | 4.00H-18 | 110/90-17 60 P | 180/55 ZR 17 |
| Dimensions: | Length: 2150 mm / 84.6 in Width: 920 mm / 36.2 in Height: 1200 mm / 47.2 in | Length 2192mm / 86.2 in Width 780 mm / 30.7 in Height 1135 mm / 44.8 in | Length 2090 mm / 82.2 in Width 780 mm / 30.7 in Height 1035 mm / 40.7 in | Length: 2055 mm / 80.8 in Width: (handlebars) 740 mm / 29.1 in Height: (without mirrors) 1060 mm / 41.7 in |
| Wheelbase: | 1430 mm / 56.2 in | 1426 mm / 56.1 in | 1400 mm / 55.1 in | 1410 mm / 55.5in |
| Dry Weight: | 98 kg / 216 lbs | 210 kg / 463 lbs | 142 kg / 313 lbs | 167 kg / 368 lbs |
| Fuel Capacity: | 8 Litres / 2.11 Us gal | 17.9 Litres / 4.5 US gal | 14 Litres / 3.7 US gal | 17.4 Litres / 4.6 US gal / 3.8 Imp gal |