seconds, reaching . The 1/4 mile result Motorcyclist reported was 9.87 seconds at , and Sport Rider found 9.95 seconds at . Monocoque aluminum frame While most sport bikes use an aluminum perimeter frame, the ZX-12R uses a unique monocoque aluminum frame. Described by Cycle World in 2000 as a "monocoque backbone...a single large diameter beam" and "Fabricated from a combination of castings and sheet-metal stampings", this was the first use of this type of frame on a mass-produced production motorcycle. This design surpasses the level of chassis strength and stiffness associated with conventional aluminum perimeter frames. Its intention was also to make the bike narrower, and there by more aerodynamic. The design saves space by housing the battery and incorporating an efficient airbox and a cartridge-type air filter that slides into the frame. It was fuel-injected with four Mikuni 46 mm throttle bodies and was Kawasaki's first fuel-injected sport bike since the 1981–1985 GPZ1100. Model history The 2002 model was updated with 140 changes. While some of those changes made the bike easier to launch- such as a heavier crankshaft, a reshaped flywheel, and fuel mapping changes- it had less than the 2000 and 2001 models' . It had a revised suspension with stiffer front fork springs and a softer rear shock spring. The front fender had cosmetic changes, and panels were added to the inner fairing below the instruments and bars. The centrally-located ram-air intake scoop protruding from the fairing that takes advantage of the higher front air pressure was revised. This intake is integrated into a wider and shorter front cowling from Kawasaki Aerospace Company division, lowering the drag coefficient by one point from 33 to 32. The last update was in 2004, with the addition of radial brakes and more fuel injection changes. The ZX-12R was discontinued in 2006, and was followed by the 2006ZX-14 (ZZR1400) which had a similar monocoque frame. See also List of fastest production motorcycles by acceleration References Ninja ZX-12R Sport bikes Motorcycles introduced in 2000