Kawasaki GPZ750

Kawasaki GPz750 (ZX750A1-3)

Manufacturer	Kawasaki
Also called	ZX750A1-3, GPz750
Parent company	Kawasaki Heavy Industries
Production	1982–1985
Predecessor	Kawasaki KZ750-R1, Z750 (non-US)
Successor	GPZ750R (Liquid-cooled version)
Class	Sport bike
Engine	738 cc (45.0 cu in), 4-stroke, transverse 4-cylinder, air-cooled, DOHC, 2 valve per cylinder
Bore / stroke	66 mm × 54 mm (2.6 in × 2.1 in)
Power	60 kW (80 bhp) @ 9,500 rpm (claimed)[1]
Torque	65.8 N⋅m (48.5 lb⋅ft) 7,500 rpm (claimed)[1]
Ignition type	Electronic
Transmission	5-speed
Frame type	Steel
Suspension	Front: telescoping fork Rear: aluminum swingarm, dual shock (1982) Uni-Trak (1983– )
Brakes	Front: dual disc Rear: single disc
Tires	Tubeless, front: 110/80-18 Rear: 130/80-18
Rake, trail	28°, 100 mm (4.1 in)
Wheelbase	1,500 mm (59 in)
Dimensions	L: 2,185 mm (86.0 in) W: 775 mm (30.5 in) H: 1,215 mm (47.8 in)
Seat height	780 mm (31 in)
Weight	230 kg (506 lb) (1⁄2 tank)[1] (wet)
Fuel capacity	22 L (4.8 imp gal; 5.8 US gal)
Related	GPz750 Turbo, GPz 750R, Z 750

The Kawasaki GPz750 was a sport bike introduced by Kawasaki in 1982. In comparison with the KZ750, it had many updates focusing on high performance ^{[needs context]}. Changes started at the front, with tapered bearings in the steering head instead of the KZ750's ball bearings, and the upper triple clamp was changed also, giving the GPz solid aluminum clip-on handle grips instead of the traditional handlebar. A bikini fairing almost identical to the one on the GPz550 was added too. The GPz750 had increased power, with slightly higher compression, and camshafts designed to get the valves to full lift quicker, and fitting Mikuni 34mm carburetors for smoother airflow. The cylinder heads were also given a new combustion chamber, and porting and polishing from the factory. An oil-cooler was also added. The GPz750 was the quickest factory 750, as Cycle World recorded a time of 11.93 seconds at 109.62 mph (176.42 km/h) in the 1/4 mile.^[1] The GPz750 underwent some significant changes in 1983. The original was based on the 1981 KZ750-E.^[2] Kawasaki retired the KZ750 after 1983. The 1983 KZ750L3 was nearly identical to the '82 GPz750, but for different colors, no bikini fairing, and without the porting & polishing in the cylinder head.^[3]

In 1983, the engine was modified further, mostly in the combustion chamber, and an all-new frame was used with Uni-Trak suspension. There were also modifications to the suspension, brakes and wheels, as well as the bodywork. The bike became more sport-oriented, but lost some of the versatility of the '82. ^{[needs context]}