The Kawasaki Ninja ZX-12R is a sport bike that Kawasaki made from 2000 through 2006. Its 1,199 cc inline four produced 178 hp at low speed and 190 hp at high speed thanks to ram-air intake, making it the most powerful production motorcycle until the ZX-14 arrived.
Kawasaki Ninja ZX-12R at a glance
| Maker | Kawasaki |
|---|---|
| Produced | 2000–2006 |
| Class | sport bike, Ninja series |
| Engine | 1,199 cc liquid-cooled inline four, DOHC, 4 valves per cylinder |
| Bore × stroke | 83 × 55.4 mm |
| Power | 178 hp; 190 hp with ram air |
| Rear-wheel output | 161.2 hp |
| Induction | four Mikuni 46 mm throttle bodies |
| Frame | aluminium monocoque, first on a mass-production bike |
| Front fork | 43 mm upside-down, adjustable |
| Top speed | electronically limited to about 300 km/h |
| 0–60 mph | 2.59 seconds (Cycle World) |
| Braking 60–0 | 36 m |
| Replaced by | ZX-14 (ZZR1400), 2006 |
The English article is the base; the Italian one adds engine and chassis detail.
History of the Kawasaki Ninja ZX-12R
The ZX-12R was Kawasaki’s answer to the Suzuki Hayabusa, and at its launch it was the firm’s flagship sport bike. Its engine generated 161.2 hp at the rear wheel, the chassis and brakes matched that power, and the result was described as docile at low speeds and very easy to handle in heavy traffic, yet with strong acceleration. Cycle World measured 0 to 60 mph in 2.59 seconds, an electronically limited top speed of 187 mph, a 60 to 0 mph braking distance of 36 m and a quarter mile of 10.04 seconds at 231.39 km/h; Motorcyclist recorded 9.87 seconds and Sport Rider 9.95 seconds.
The speed agreement
From its first model year the ZX-12R’s top speed was restricted under a voluntary gentlemen’s agreement between BMW Motorrad and the Japanese manufacturers, made in late 1999 amid fears of government regulation of motorcycle speeds, mainly in Europe. Kawasaki had planned a world press event to launch its answer to the Hayabusa, but cancelled it abruptly and released the ZX-12R with a revised engine control unit limiting speed to about 300 km/h, without fanfare.
Monocoque frame
While most sport bikes use an aluminium perimeter frame, the ZX-12R used a monocoque aluminium frame: a single large-diameter beam made from a combination of castings and sheet-metal stampings, the first of its kind on a mass-produced motorcycle. It was stiffer than a conventional perimeter frame, made the bike narrower and therefore more aerodynamic, and saved space by housing the battery and an efficient airbox with a cartridge-type filter that slides into the frame. The engine was fuel injected with four Mikuni 46 mm throttle bodies, Kawasaki’s first fuel-injected sport bike since the GPZ1100 of 1981–1985.
Model history
The 2002 model was updated with 140 changes. Some made the bike easier to launch, such as a heavier crankshaft, a reshaped flywheel and revised fuel mapping, but output fell by 1.3 hp from the 162.7 hp of the 2000 and 2001 models. The suspension was revised with stiffer fork springs and a softer rear spring, the front fender changed and panels were added to the inner fairing. The central ram-air scoop was redesigned by Kawasaki’s aerospace division and integrated into a wider, shorter front cowling, lowering the drag coefficient from 33 to 32. The last update came in 2004 with radial brakes and further injection changes. The ZX-12R was discontinued in 2006 and followed by the ZX-14, which used a similar monocoque frame.
Design and features
- Ram-air power: 178 hp rising to 190 hp at speed, the strongest production engine of its day.
- Monocoque frame: a single large beam that houses the battery and airbox, first on a mass-production motorcycle.
- Speed limiter: capped at about 300 km/h under the manufacturers’ voluntary agreement.
- Fuel injection: four 46 mm Mikuni throttle bodies, Kawasaki’s first injected sport bike since the GPZ1100.
- Radial brakes from 2004: the final update of the model.
Kawasaki Ninja ZX-12R versions
- ZX-12R (2000–2001): the original, 162.7 hp at the rear wheel.
- 2002 model: 140 changes, heavier crank, revised suspension and aerodynamics.
- 2004 model: radial brakes and further injection changes.
The ZX-12R was replaced by the Ninja ZX-14, and it belongs to the same Ninja family as the ZX-9R. More models are in the Kawasaki collection.
Video: TOP SPEED KAWASAKI ZX12R NINJA 350KM/H ACCELERATION(POLSKA)
Video by SpeedGabliChuck on YouTube.
Sources
- Kawasaki Ninja ZX-12R, English Wikipedia: power, performance, frame, model history, speed agreement
- Kawasaki Ninja ZX-12R, Italian Wikipedia: engine dimensions, fork, 2002 and 2004 updates
