Kawasaki ZX-4RR Ninja KRT (2023) vs Kawasaki BR 250 Casual Sports (1985) vs Kawasaki ZR-X 400 (2007-08) vs Kawasaki GPX 600R Ninja / ZX 600R (1985-86)
Comparison technical specifications
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| Make: | Kawasaki | Kawasaki | Kawasaki | Kawasaki |
| Model: | ZX-4RR Ninja KRT | BR 250 Casual Sports | ZR-X 400 | GPX 600R Ninja / ZX 600R |
| Years: | 2023 | 1985 | 2007-08 | 1985-86 |
| Engine: | Four stroke, transverse four cylinder, DOHC, 4 valves per cylinder | Four stroke, single cylinder, DOHC, 4 valve | Four stroke parallel twin cylinder. DOHC, 2 valves per cylinder | Four stroke, transverse four cylinders, DOHC, 4 valve per cylinder |
| Capacity: | 399 cc / 24.3 cu-in | 248 cc / 15.2 cu-in | 399 cc / 24.4 cu-in | 598 cc / 36.1 cu-in |
| Bore x Stroke: | 57.0 x 39.2 mm | 74 X 58mm | 57.5 х 38.5 mm | 60 x 52.4 mm |
| Cooling System: | Liquid cooled | Liquid cooled | Liquid cooled | Liquid cooled |
| Compression Ratio: | 12.6:1 | NA | 11.2:1 | 11.71 |
| Induction: | EFI with four 34mm throttle bodies | Carburetor | 4x Keihin CVK30 carburetors | 4x 32mm Keihin CV carburetors |
| Starting: | Electric | Electric | Electric | Electric |
| Max Power: | - | 34 hp / 25.3 kW @ 10000 rpm | 53 hp / 39.5 kW @ 11500 rpm | 84 hp / 62 kW @ 11000 rpm |
| Max Torque: | 35.9 Nm / 26.5 lb-ft @ 11000 rpm | 24.5 Nm / 18 lb-ft @ 9000 rpm | 37 Nm / 27.3 lb-ft @ 9000 rpm | 42 ft-lb / 5.8kgf-m @ 9000 rpm |
| Transmission: | 6-speed with quickshifter and Positive Neutral Finder | 6 Speed | 6 Speed | 6 Speed |
| Final Drive: | Sealed chain | Chain | Chain | Chain |
| Front Suspension: | 37mm Showa SFF-BP inverted fork spring-preload adjustable | Telescopic forks | 39mm RWU telescopic forks | 38mm Telescopic with electronic anti-drive. |
| Rear Suspension: | Linkage-assisted, fully adjustable, cantilevered Showa BFRC Lite piggyback-reservoir shock | Dual shocks | Dual shocks preload adjustment | Rising rate monoshock with adjustable preload and rebounding preload. |
| Front Brakes: | 2 x 290mm semi-floating petal disc with radially mounted 4-piston monobloc calipers | Single disc | 2x 298mm discs 6 piston calipers | 2x 270mm discs |
| Rear Brakes: | Single 290mm petal disc with single-piston caliper | Drum | Single 240mm disc 2 piston caliper | Single 130mm disc |
| Front Tyre: | 120/70 x 17 | 90/90 16 | 110/80-17 | 110/80 V16 |
| Rear Tyre: | 160/60 x 17 | 110/80 18 | 150/70-18 | 130/90 V16 |
| Seat Height: | 800 mm / 31.5 in | 730 mm / 28.7 in | 780 mm / 30.7 in | 760 mm / 30.0 in |
| Fuel Capacity: | 15 Litres / 4.0 US gal | 12 Litres / 3.1 US gal | 16 Litres / 4.2 US gal | 19.5 Litres / 5.1 US gal |