The Specifications of a Ninja 636

Written by james rutter
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The Specifications of a Ninja 636
From 2002 to 2006, the Ninja ZX-6R featured a 636cc displacement engine. (man on a red bike image by Galina Barskaya from

Since 1995, the Japanese corporation Kawasaki Heavy Industries, Ltd has manufactured the Ninja ZX-6R as part of its line of sport bikes. From 2002 to 2006, the Ninja featured a 636cc displacement engine, and the bike informally became known as the Ninja 636. In 2007, Kawasaki redesigned the engine, and the Ninja ZX-6R now features a smaller displacement 599cc engine.


The basic 636cc in the Ninja 636 consisted of a liquid-cooled dual-overhead cam, inline four-cylinder engine with four valves per cylinder (for a total of 16 valves). Kawasaki installed two versions of its 636cc engine in the Ninja 636 produced from 2002 to 2006. A Ninja 636 made from 2002 to 2004 included, for the first time, an electronic fuel injection (rather than carburettor) system. In the 2005 and 2006 models, Kawasaki changed the fuel injection system from electronic to a digital duel-injector fuel injection system (or DFI). Although the displacement and horizontal inline configuration of the engine remained the same, this change resulted in a slight increase in power and performance. Both generations of this engine model utilised an electric starter and a manual six-speed chain-driven transmission to transfer power to the rear tire.


According to, the 2002 to 2004 Ninja 636s equipped with the electronic fuel injection system could generate 125 horsepower (hp) and 49.4ft/lbs. of torque with a compression ratio of 12.8:1. reports that the digital fuel injection engine in the 2005 and 2006 Ninja 636 rated 50.8ft/lbs. of torque at 12,000 rotations-per-minute and achieved a compression ratio of 13.9:1. The "Top Speed" website states that the 2005 and 2006 models cranked out 130hp at 14,000rpm. "Top Speed" reports that the 2005 and 2006 models could accelerate from 0 to 60 miles per hour (mph) in 3.1 seconds, take the quarter-mile in 10.8 seconds and peak at a top speed of 160mph.

Dimensions and Features

Kawasaki built the Ninja 636 on a steel chassis. The seat height varied between models: 2002 to 2004 Ninja 636s had a seat height of 32.5 inches while 2005 and 2006 models stood 32.3 inches at the seat. All bikes in this line could seat a driver and one passenger. From 2002 to 2004, the Ninja 636 had a dry weight of 161kg.; the 2005 and 2006 models weighed 16.3kg. All models of the Ninja 636 came equipped with a 4.5 gallon fuel tank. The Ninja 636 ran on size 120/65-ZR17 front tires and 180/55-ZR17 rear tires that spanned a wheelbase of 55.1 inches. A forward mounted digital instrumentation panel showed speed, odometer readout and fuel and temperature levels. These bikes used rear disc and front dual disc brakes and a front inverted fork and rear gas-charged shock suspension.

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