| MODEL | KAWASAKI ZR 400X ZEPHYR 1998 - 2000 |
| Year | 1998 - 2000 |
| Engine Type | Four-stroke, transverse four-cylinder, DOHC, 4 valves per cylinder |
| Displacement / Capacity | 399 cc / 24.4 cu in |
| Bore X Stroke | 55 x 42 mm |
| Compression Ratio | 10.3:1 |
| Cooling System | Air cooled |
| Max Power | 36.8 kW / 49 hp @ 11000 rpm |
| Max Torque | 3.1 kgf m / 22.4 lb-ft @ 10500 rpm |
| Ignition | Full transistor |
| Induction | 4 x Keihin CVK30 carburettors |
| Start System | Electric |
| TRANSMISSION SPECS | |
| Lubrication | — |
| Gear Box | 6-speed |
| Clutch | Wet multi-disc |
| Final Drive | Chain |
| CHASSIS SPECS | |
| Frame | — |
| Front Suspension | Telescopic forks |
| Rear Suspension | Dual shocks |
| Front Brakes | 2 x discs |
| Rear Brakes | Single disc |
| DIMENSION SPECS | |
| Overall Length | — |
| Overall Width | — |
| Overall Height | — |
| Seat Height | 770 mm / 30.1 in |
| Wheelbase | 1435 mm / 56.5 in |
| Ground Clearance | 120 mm / 4.1 in |
| Dry Weight | 179 kg / 395 lbs |
| Wet Weight | — |
| WHEEL SPECS | |
| Front Tyre | 110/80-17 |
| Rear Tyre | 140/70-18 |
| FUEL SYSTEM | |
| Fuel Capacity | 14 Litres / 3.6 US gal |
| Fuel Consumption | — |
| Top Speed | — |
The 400X was the later, updated version of the 400 Zephyr, identified by its 4-valve head and higher 10.3:1 compression. It kept the same retro Z1-style naked layout, air-cooled transverse four and chain drive. This version kept the Zephyr's reputation for simple, reliable everyday transport.
