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  The 1985 Kawasaki GPZ 600R Ninja, also known as the ZX600R Ninja or just the Ninja 600, is a powerful sports bike. The Kawasaki engineers put significant effort into reducing the bike's size and weight to boost its performance. Alloys and plastics were used wherever possible to reduce weight. The alternator is also reversed to lessen engine width in accordance with the "light is right" philosophy of this model.
  
  

Engine

• The 1985 Kawasaki GPZ 600R Ninja has a four-stroke four-cylinder engine. The engine is liquid cooled and features a DOHC, or double overhead camshaft with four valves per cylinder. A 60mm by 52.4mm bore and stroke gives the Ninja 600 combustion chamber displacement of 592 cc. Compression ratio is 11.0 to 1. The engine is started by a battery-powered, magnetically triggered inductive electric ignition. At 10,500 revolutions per minute, the engine produces 75 horsepower, or 54.7 kilowatts. The torque measures 37 pound-feet, or 5.1 kilogram meters, at 9,000 rpm.
  
  

Fairing

• To further reduce the bike's weight, its fairing is almost completely composed of ABS and PBT plastic, which not only is lighter than metal but also has better aerodynamic properties.
  
  

Suspension, Brakes and Tires

• The 1985 Kawasaki GPz 600R Ninja comes with an AVDS adjustable anti-dive front suspension with 7mm air-assisted forks and 140mm of wheel travel. The rear suspension consists of a single air-assisted shock absorber and 130mm of rear wheel travel. The bike has dual disc front brakes with single piston calipers and a single disc rear brake. It features a 110/90-16 front tire and a 130/90-16 back tire.
  
  

Other Specifications

• The motorcycle comes with a six-speed transmission. The dry weight of the motorbike is 195 kilograms, or 429 pounds. The bike has 18 liters, or 4.76 gallons, of fuel capacity. The 1985 Kawasaki GPz 600R Ninja gets 47.8 miles per gallon and can reach a maximum speed of 127.5 mph.