Kawasaki GPz 600R Ninja / ZX 600R Ninja (1985-86) vs Kawasaki ZX-R 250 Ninja (1997-98) vs Kawasaki VN 650 Vulcan S / ABS (2017-18)
Comparison technical specifications
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| Make: | Kawasaki | Kawasaki | Kawasaki |
| Model: | GPz 600R Ninja / ZX 600R Ninja | ZX-R 250 Ninja | VN 650 Vulcan S / ABS |
| Years: | 1985-86 | 1997-98 | 2017-18 |
| Engine: | Four stroke, transverse four cylinder, DOHC, 4 valves per cylinder | Four stroke, transverse four cylinder, DOHC, 4 valves per cylinder. | Four stroke, parallel twin cylinder. DOHC, 4 valves per cylinder. |
| Capacity: | 592 cc / 36.1 cu-in | 249 cc / 15.2 cu-in | 649 cc / 39.65 cu /in |
| Bore x Stroke: | 60 х 52.4 mm | 49 x 33.1 mm | 83 x 60 mm |
| Cooling System: | Liquid cooled | Liquid cooled | Liquid cooled |
| Compression Ratio: | 11.0:1 | 12.2:1 | 10.8:1 |
| Induction: | 4x 32mm Keihin CVK carburetors | 4x Keihin CVK D30 carburetors | Fuel system DFI® with two 38mm throttle bodies, with sub-throttles |
| Ignition: | Digital | TCBI | TCBI with digital advance |
| Starting: | Electric | Electric | Electric |
| Max Power: | 75 hp / 54.7 kW @ 10500 rpm | 45 hp / 32.8 kW @ 15000 rpm | 61 hp / 44.5 kW) @ 7500 rpm |
| Max Torque: | 5.1 kgf-m / 36.8 lb-ft @ 9000 rpm | 2.6 kgf-m / 24.5 Nm @ 11500 rpm | 63 Nm / 46.5 ft.lb @ 6600 rpm |
| Transmission: | 6 Speed | 6 Speed | 6 Speed with positive neutral finder |
| Final Drive: | Chain | Chain | Sealed chain |
| Front Suspension: | 37mm Air assisted forks, AVDS adjustable anti-dive | Telescopic forks | 41 mm hydraulic telescopic fork |
| Front Wheel Travel: | 140 mm / 5.5 in | 120 mm / 4.7 in | 129 mm / 5.1 in |
| Rear Suspension: | Single air assisted shock adjustable for rebound damping | Uni-track, Swing arm | Lay-down offset rear shock with linkage and adjustable preload |
| Rear Wheel Travel: | 130 mm / 5.1 in | 113 mm / 4.4 in | 81.2 mm / 3.2 in |
| Front Brakes: | 2x discs 1 piston calipers | 2x discs 2 piston calipers | Single 300mm disc 2 piston caliper |
| Rear Brakes: | Single disc 1 piston caliper | Single disc 1 piston caliper | Single 250mm disc 1 piston caliper |
| Front Tyre: | 110/90-16 | 110/70-R17 54H | 120/70 -R18 |
| Rear Tyre: | 130/90-16 | 140/60-R18 64H | 160/60 R17 |
| Fuel Capacity: | 18 Litres / 4.7 US gal | 15 Litres / 3.4 US gal | 14 Litres / 3.7 US gal |