The Kawasaki Ninja 600R (North America) or GPZ 600R ( Europe 1985-90) and GPX 600R (Europe 1988-97) is a sport bike motorcycle made by Kawasaki ZX600 line of motorcycles sold in North America. In Europe both models were different in every country with unlike colors and designations.

Kawasaki Ninja 600R
1992 Kawasaki GPX 600R
ManufacturerKawasaki
Also calledGPZ600R (1985-90), GPX600R (1988-97), Ninja 600RX, ZX600A-B (GPZ), ZX600C (GPX)
Parent companyKawasaki Heavy Industries
Production1985–1990 (GPZ), 1988–1997 (GPX)
SuccessorKawasaki ZZR600
ClassSport bike
Engine592 cc (36.1 cu in), liquid-cooled DOHC 4V/cyl. 4-stroke, transverse 4-cylinder
Bore / stroke60.0 mm × 52.5 mm (2.36 in × 2.07 in)
Transmission6-speed constant mesh, wet multi-disc clutch, chain

With minor variations over the years, in 1988 the GPX model received changes like a new double cradle frame, a different anti-dive system that Kawasaki called Electronic Suspension Control System (ESCS), meaning to improve the Automatic Variable Damping System (AVDS) suspension from the original GPZ. The GPX had more power (84 hp against 76 in the GPZ) and a higher top speed (140 mph versus GPZ's 135 mph).[citation needed]

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