Kawasaki ZXR 750

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The Kawasaki ZXR 750 is a super sports - motorcycle of the Japanese manufacturer Kawasaki built with 750 cc displacement and was from 1989 to 1995. Especially the "vacuum cleaner hose models" built between 1989 and 1992 enjoy cult status.

Kawasaki ZXR 750 R.

Series

ZX 750 H1 - 1989

The H1 was the first ZXR whose characteristic feature were the mentioned snorkels. It was built as a response to the then very successful Suzuki GSX-R 750 .

Technical data of the H:

  • Displacement: 748 cm³
  • Engine: 4-stroke DOHC, bucket tappets
  • Cooling: liquid-cooled
  • Bore × stroke: 68.0 × 51.5 mm
  • Compression: 11.3: 1
  • Engine output: 74 kW (100 PS), at 10,000 rpm
  • Mixture preparation: Keihin CVK-D 36x4 carburetor
  • Starting system: electric starter
  • Ignition system: transistor
  • Ignition advance: from 10 ° before TDC / 1000 / min
  • Ignition time: up to 35 ° before TDC / 3500 / min
  • Spark plugs: NGK CR9E or ND U27ESR-N
  • Firing order: 1-3-4-2
  • Numbering of the cylinders: from left to right 1-2-3-4
  • Tax times:
Inlet opens 36 ° before TDC
Inlet closes 65 ° after BDC
Outlet opens 55 ° before BDC
Outlet closes 35 ° after TDC
  • Lubrication system Compressed air system (wet sump with cooler)
SAE 10 W-40 / SAE 10 W-50/20 W-40/20 W-50
Quality SE or SF
Oil content: 3.7 liters
  • Other: telescopic fork, swing arm with cover, full cladding, aluminum frame with screwed beams,
  • Tires: front 120/70/17, rear 170/60/17.

In 1990, further development followed with the H2, with changes to the engine and the cylinder head, a modified rocker arm and a larger carburetor system, as well as a larger radiator. In the unthrottled version it reaches up to 87 kW.

ZX 750 J / K - 1991

The ZX 750 J / K was a new development with an aluminum frame without joists, an upside-down fork and a short-stroke motor with rocker arms instead of bucket tappets . The K-model was the single-seat racing version, of which only 1000, but actually around 2500, were produced worldwide. In contrast to the basic J model, it has increased engine output, which is achieved through more aggressive valve timing, modified camshafts and double valve springs. In addition, it has a changed gear ratio with an extremely long first gear, a flat slide carburetor and a fully adjustable chassis. An aluminum tank and an optimized rear frame are installed to reduce weight. The original list price was 25,000 DM.

Technical specifications:

  • Displacement: 749 cm³
  • Bore × stroke: 71 × 47.3 mm
  • Power: J 74 kW (101 PS) / K 90 kW (122 PS)
  • Weight: J 225 kg / K 220 kg
  • Fork tube diameter: J 43 mm / K 41 mm
  • Tires: front 120/70/17, rear 180/55/17
  • Ignition time: from 10 ° before TDC (at 1100 rpm) to 42.5 ° before TDC (at 6200 rpm)
  • Timing J:
Inlet opens: 25 ° before TDC
closes: 55 ° after BDC
Duration: 260 °
Outlet opens: 55 ° before BDC
closes: 25 ° after TDC
Duration: 260 °
  • Control times K:
Inlet opens: 39 ° before TDC
closes: 69 ° after BDC
Duration: 288 °
Outlet opens: 65 ° before BDC
closes: 35 ° after TDC
Duration: 280 °
  • Kit motor output 1992: 140 hp at 13,000 rpm

ZX 750 L / M - 1993

The L / M series was the first series machine with a working ram-air system, while the "dynamic pressure ventilation of the engine top" was dropped through the eye-catching hoses. The engine was taken over unchanged from the K model, but the L got a gearbox that is suitable for everyday use. However, this model was not as successful as its predecessor because it gained weight in contrast to the competition and was 30 kg heavier than the Honda Fireblade with a displacement of 900 cm³.

Here, too, Kawasaki built a single-seat racetrack version (the M), which is, however, even less common than the K and of which only 54 units were imported to Germany. With a machine of this type, Scott Russell became world champion in the Superbike class in 1993. In contrast to the L model, which was built until 1995, it was only produced in 1993 and 1994. It differed from the L model, among other things, in a transmission with a long first gear and short gradation of the other gears, flat slide carburetor, a fully adjustable chassis, a height-adjustable swing arm pivot point, a one-man tail, special paintwork, as well as a smaller battery and an aluminum tank.

Technical specifications:

  • Displacement: 749 cm³
  • Bore × stroke: 71 × 47.3 mm
  • Power: L 90 kW (122 PS) / M 94 kW (128 PS)
  • Weight: L 234kg / M 227kg
  • Tires: front 120/70/17, rear 180/55/17
  • Control times L / M:
Inlet opens: 39 ° before TDC
closes: 69 ° after BDC
Duration: 288 °
Outlet opens: 65 ° before BDC
closes: 35 ° after TDC
Duration: 280 °
  • Kit motor performance 1994:
Standard: 140 hp at 13,000 rpm
Option: 145 hp at 13,000 rpm

Relationships

While the H still has a recognizable, construction-related similarity to the typical 1980s models, it was ultimately a new development based on the very successful GPX models, the JKLM models have named identical components of the ZX 9 R , model ZX 900 B. The engine is identical except for the changed cubic capacity and reinforced crankshaft bearings.

From 1996, the versions P and N were built as successor models, the name was changed to the ZX-7 R and ZX-7 RR, which were already used abroad for the Zxr .

The engine was short-stroke again, received bucket tappets again , but retained the same performance as the old models. The 7 Series was built unchanged from 1996 until the end of production. Only the paintwork was changed every year.

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