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Suzuki GSX-R 750 model history
1988—1995


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Suzuki 1988More Suzuki models from 1988
1988 Suzuki year code: J
 
The styling went smooth and curvaceous with this model with almost everything being new - 73.0 x 44.7mm short-stroke motor, thinner piston rings, bigger main bearings, bigger valves, new high-lift camshaft, 36 mm contant-velocity semi-flatslide carbs and up rated suspension, wheels and tyres.  All this produced 112 hp at 11,000 rpm to propel a dry weight of 195 kg. Unfortunately, it lost significant ground clearance (via the exhaust) and the adoption of 17" wheels which offered only a slim margin of error.

Every detail of the chassis and engine of the GSX-R down to the single bolt was reevaluated for the new 1988 model. The fairing was redesigned for 5.7% less frontal projection and 11% lower drag. The wheelbase at 1400mm made the GSX-R the most compact bike in the class. The lightweight aluminium alloy frame incorporated 45mm box tube main section and the cast swig arm pivot resulted in 60% more ridity. Front fork stanchion tubes were increased to 43mm diameter with variable damper adjuster type inner rods. The back end featured full floating suspension with new linkage and needle bearing for smoothness. Opposed 4 piston brake calipers, new  weight-saving hollow-typecast wheels, and wide Michelin radial tyres became new standard equipment. The distinctive air-cooled with SACS engine received larger diameter oil hose and less restrictive joints for 20% increase in the coolant flow and the large 15 row cooler improved the cooling efficiency by 48%. The red zone started at 13,000 rpm. Engine bore and stroke changed from the previous 70 x 48.7mm to shorter stroke 73 x 44.7mm to reduce reciprocating motion mechanical loss. The new Slingshot carburetors were equipped with lightweight throttle valves for increased throttle responsiveness. Another important addition was the incorporation of SACI (Suzuki Condensed Air Intake) system bringing fresh air from ducts on the front of the fairing to the carburetor intake for maximizing cylinder charging efficiency.

Type: GR77B
 

GSX-R 750 1988
Overall Length: 2,055 mm (80.9 in)
Overall Width: 730 mm (28.7 in)
Overall Height: 1 100 mm (43.3 in)
Wheelbase: 1 400 mm (55.1 in)
Dry Weight: 195 kg (429 lbs)
Engine type: Air and oil-cooled 747 cc inline-4, DOHC, 16 valves. 112 hp (81.8 kW)/ 11,000 rpm, 68 Nm/ 7,000 rpm.

GSX-R 750 1988
Overall Length: 2,055 mm (80.9 in)
Overall Width: 730 mm (28.7 in)
Overall Height: 1 100 mm (43.3 in)
Wheelbase: 1 400 mm (55.1 in)
Dry Weight: 195 kg (429 lbs)
Engine type: Air and oil-cooled 747 cc inline-4, DOHC, 16 valves. 112 hp (81.8 kW)/ 11,000 rpm, 68 Nm/ 7,000 rpm.

GSX-R 750 1988
Overall Length: 2,055 mm (80.9 in)
Overall Width: 730 mm (28.7 in)
Overall Height: 1 100 mm (43.3 in)
Wheelbase: 1 400 mm (55.1 in)
Dry Weight: 195 kg (429 lbs)
Engine type: Air and oil-cooled 747 cc inline-4, DOHC, 16 valves. 112 hp (81.8 kW)/ 11,000 rpm, 68 Nm/ 7,000 rpm.


Here's even larger picture.



Suzuki 1989More Suzuki models from 1989
1989 Suzuki year code: K

 
Ground clearance was improved with the GSX-R750K and overall it was a little more developed but otherwise, much the same.  The 4-into-2 exhaust pipe introduced a year earlier received stylish stainless steel covering over the mufflers. Gear ratio revisions in 3rd, 4th and 5th gears enabled improved power control and secondary gear ratio was lowered, together with 5mm increase in the wheelbase, all combining for better sports riding on highways. The brake master cylinder controlled the 4 piston brake calipers featured four-way adjustability.

The luscious and expensive limited edition GSX-R750R was released to Japanese market with a return to the long-stroke motor of the F/G/H models.   The RK had exotic internals, 40 mm carbs and produced around 120 hp and weighted 187 kg.

Type: GR77B
 

Suzuki GSX-R750GSX-R 750 1989
Overall Length: 2,055 mm (80.9 in)
Overall Width: 730 mm (28.7 in)
Overall Height: 1 100 mm (43.3 in)
Wheelbase: 1 400 mm (55.1 in)
Dry Weight: 195 kg (429 lbs)
Engine type: Air and oil-cooled 748 cc inline-4, DOHC, 16 valves. 112 hp (81,8 kW)/ 11,000 rpm, 68 Nm/ 7,000 rpm.


Here's even larger picture.

Suzuki GSX-R750GSX-R 750 1989
Overall Length: 2,055 mm (80.9 in)
Overall Width: 730 mm (28.7 in)
Overall Height: 1 100 mm (43.3 in)
Wheelbase: 1 400 mm (55.1 in)
Dry Weight: 195 kg (429 lbs)
Engine type: Air and oil-cooled 748 cc inline-4, DOHC, 16 valves. 112 hp (81,8 kW)/ 11,000 rpm, 68 Nm/ 7,000 rpm.

Suzuki GSX-R750GSX-R 750 1989
Overall Length: 2,055 mm (80.9 in)
Overall Width: 730 mm (28.7 in)
Overall Height: 1 100 mm (43.3 in)
Wheelbase: 1 400 mm (55.1 in)
Dry Weight: 195 kg (429 lbs)
Engine type: Air and oil-cooled 748 cc inline-4, DOHC, 16 valves. 112 hp (81,8 kW)/ 11,000 rpm, 68 Nm/ 7,000 rpm.

 
500 limited edition (some claim 1000) GSX-R750R ( the 'Double R') serving as ready-to-race platform was released to Japanese market. The newly redesigned engine reverted to the original long stroke (70 x 48.7mm) configuration. Crankcase, crankshaft connecting rods and clutch were among the critical areas receiving more attention necessary for the race duty. The 'Double R' also received new 40mm Slingshot carburetor and 4-into-1 exhaust pipe as well as close ratio gearbox, rear swing arm with sub frame, new aerodynamic fiber with large air intake duct, solo seating with race number box and 19 liter aluminium fuel tank as standard equipment. The dry weight measured, 187kg.

Type: GR79B
Engine type: R714
 
Suzuki GSX-R750GSX-R 750 R 1989
Overall Length: 2,055 mm (80.9 in)
Overall Width: 730 mm (28.7 in)
Overall Height: 1 100 mm (43.3 in)
Wheelbase: 1 400 mm (55.1 in)
Dry Weight: 187 kg (411 lbs)
Engine type: Air and oil-cooled 748 cc inline-4, DOHC, 16 valves. 120 hp (87,6 kW)/ 11,000 rpm, 68 Nm/ 7,000 rpm.

Suzuki GSX-R750RGSX-R 750 R 1989
Overall Length: 2,055 mm (80.9 in)
Overall Width: 730 mm (28.7 in)
Overall Height: 1 100 mm (43.3 in)
Wheelbase: 1 400 mm (55.1 in)
Dry Weight: 187 kg (411 lbs)
Engine type: Air and oil-cooled 748 cc inline-4, DOHC, 16 valves. 120 hp (87,6 kW)/ 11,000 rpm, 68 Nm/ 7,000 rpm.




Suzuki 1990More Suzuki models from 1990
1990 Suzuki year code: L

 
The GSX-R750L was possibly the best of the oil-cooled models.  Big changes included inverted forks and, importantly, a return to the long-stroke motor (the short-stroke wasn't so good in race-trim but was OK for the road).  Other modifications included a 4-1 exhaust, steering damper, 38 mm carbs (up 2 mm on the standard K yet 2 mm smaller than the RK), smaller valves, new conrods, lighter pistons, large capacity oil pump, larger curved oil cooler and the rear rim became the 'standard' 17" x 5.5" item.  Power was up to 115 hp at 11,000 rpm while weight was down to 193 kg.

Drawing on the invaluable experiences gained racing, the 1990 model received many of the features of the race version GSX-R750R at an affordable price. The same long-stroke engine (70 x 48.7mm) of the 'Double R' became standard, with new pistons to match the new combustion chamber design in the cylinder head and strengthened connecting rods. New 38mm Slingshot carburetor, Curved-core Radial Flow oil cooler and stainless steel 4-into-2-into-1 exhaust per set were adopted. Both 41mm inverted tube front fork and remote reservoir rear shock became fully adjustable. Rear wheel rim was widened and equipped with Michelin radial tyres. 

Type: GR7AB
 

Suzuki GSX-R750GSX-R 750 1990
Overall Length: 2,070 mm (81.5 in)
Overall Width: 730 mm (28.7 in)
Overall Height: 1,135 mm (44.7 in)
Wheelbase: 1 420 mm (55.9 in)
Dry Weight: 193 kg (425 lbs)
Engine type: Air and oil-cooled 748 cc inline-4, DOHC, 16 valves. 115 hp/ 11,000 rpm.



Suzuki 1991More Suzuki models from 1991
1991 Suzuki year code: M
 
The 1991-year's GSX-R750M weighed 15 kg more than the previous model! Some Suzuki sales brochures didn't even bother to quote a weight figure.  The weight factor alone sends this bike to the back of the GSX-R pack.  New aerodynamic fairing with slanted nose to reduce frontal drag, with distinctive headlight cover and running lights. The seat was enlarged and twin tail lamp design graced the backend. The oil-cooled SACS engine received internal refinement of adopting one rocker arm per valve from the previous of one per two valves, stronger valve springs and an exhaust cam with 7 degrees less duration to give 116 hp.
 

GSX-R 750 1991
Overall Length: 2,070 mm (81.5 in)
Overall Width: 730 mm (28.7 in)
Overall Height: 1,135 mm (44.7 in)
Wheelbase: 1 420 mm (55.9 in)
Dry Weight: 208 kg (458 lbs)
Engine type: Air and oil-cooled 749 cc inline-4, DOHC, 16 valves. 116 hp (84.7 kW)/11,000 rpm.




Suzuki 1992More Suzuki models from 1992
1992 Suzuki year code: N
 
New liquid-cooled engine debuted for the 1992-year's GSX-R750WN (W meant Water-cooling) to match and reduce the increasing heat under severe racing conditions. However, the invaluable seven years of oil-cooling experience was not abandoned completely and the new engine featured the best of both worlds: oil injection piston cooling and water-cooled oil-cooler were among the features incorporated into the new engine to achieve compactness and reliability, enabling cylinder pitch reduction by 10mm and crankcase width by 57mm.

Headlight cover became cheaper/lighter plastic rather than the expensive glass of the previous model.  New 5-sided aluminium pipe frame with sand-casted steering head section and cast swing arm pivot increased the torsional resistance by 24%. The new monocoque swing arm was pressed arms of asymmetrical design working with new link type rear suspension. In isolation, a good bike but the other manufacturers had better bikes to offer.  Dry weight was still 208 kg and power was up to 118 hp at 11,500 rpm.
 
Suzuki GSX-R750GSX-R 750 1992
Overall Length: 2,070 mm (81.5 in)
Overall Width: 730 mm (28.7 in)
Overall Height: 1,135 mm (44.7 in)
Wheelbase: 1,440 mm (56.7 in)
Dry Weight: 208 kg (458 lbs)
Engine type: Water-cooled 749 cc inline-4, DOHC, 16 valves. 118 hp/11,500 rpm, 73 Nm/ 8,500 rpm.


Here's even larger picture.
Suzuki GSX-R750GSX-R 750 1992
Overall Length: 2,070 mm (81.5 in)
Overall Width: 730 mm (28.7 in)
Overall Height: 1,135 mm (44.7 in)
Wheelbase: 1,440 mm (56.7 in)
Dry Weight: 208 kg (458 lbs)
Engine type: Water-cooled 749 cc inline-4, DOHC, 16 valves. 118 hp/11,500 rpm, 73 Nm/ 8,500 rpm.




Suzuki 1993More Suzuki models from 1993
1993 Suzuki year code: P

 
The second year or the water-cooled engine, the 1993-year's GSX-R750WP received mostly cosmetic changes. The liquid-cooled DOHC 4 valve engine was designed to lower the center of gravity by positioning the crankshaft low. The valve angle was set at 16 degrees, 4 degrees less than that of the final air-cooled SACS engine Thinner valve stems and Direct-action valve train also contributed to make this engine a compact unit excelling at high rpm, achieving high compression ratio of 11.8, the highest in this class. SCAI (Suzuki Condensed Air Intake) system allowed optimal intake of fresh air to the engine under all conditions.
 

GSX750RGSX-R 750 1993
Overall Length: 2,070 mm (81.5 in)
Overall Width: 730 mm (28.7 in)
Overall Height: 1,135 mm (44.7 in)
Wheelbase: 1,440 mm (56.7 in)
Dry Weight: 208 kg (458 lbs)
Engine type: Water-cooled 747 cc inline-4, DOHC, 16 valves. 118 hp (86.1 kW)/ 11,500 rpm, 78,46 Nm/ 9,500 rpm.

GSX-R750WGSX-R 750 1993
Overall Length: 2,070 mm (81.5 in)
Overall Width: 730 mm (28.7 in)
Overall Height: 1,135 mm (44.7 in)
Wheelbase: 1,440 mm (56.7 in)
Dry Weight: 208 kg (458 lbs)
Engine type: Water-cooled 747 cc inline-4, DOHC, 16 valves. 118 hp (86.1 kW)/ 11,500 rpm, 78,46 Nm/ 9,500 rpm.




Suzuki 1994More Suzuki models from 1994
1994 Suzuki year code: R

 
A full engine, gearbox and chassis redesign came with the GSX-R750WR including improved engine internals, revised gears and forks, stainless steel header pipes and six-piston brakes.   Weight was down to 199 kg - a point where the 130 hp GSX-R1100 was some 8 years earlier!  In another odd move, power was down to 112 hp at 10,500 rpm. 6 piston brake calipers and ultawide 180/55ZR17 rear tyre graced the R that weighed in 9 kg dry lighter than the 1993 production model. The same 1994 model continued to be available in 1995. 

Although standard production model, the GSX-R750SPR was designed to serve also as the Superbike racing platform and boasted performance features direct from the factory racing parts bin. Wide-mouthed TRM40 carburetor, SCAI air intake system, 4-2-1 exhaust system with increased flow, special 6-speed close-ratio gearbox, magnesium engine covers, aluminium water pump, thin-walled 43 mm inverted tube front fork, lighter and more rigid swing arm. 
 

GSX-R 750 SP 1994
Overall Length: 2,095 mm (82.5 in)
Overall Width: 730 mm (28.7 in)
Overall Height: 1,135 mm (44.7 in)
Wheelbase: 1,440 mm (56.7 in)
Dry Weight: 198 kg (436 lbs)
Engine type: Water-cooled 749 cc inline-4, DOHC, 16 valves. 118 hp (86.1 kW)/ 11,500 rpm, 78,46 Nm/ 9,500 rpm.




Suzuki 1995More Suzuki models from 1995
1995 Suzuki year code: S
 
In the fifth year since the introduction of the water-cooled engine, the 1995 model featured cosmetic changes such as the silver colouring treatment on the outer of the inverted tube front fork (from blue of 1994 model) and new overall colouring schemes. The standard model did not lack in performance, as it continued with main features introduced with the 1994 model: the lightweight and rigid aluminium frame with thin-walled 43 mm inverted inner tube fork: engine cover parts of magnesium; aluminum water pump; 6-piston front brake calipers; the swing arm featuring aluminum box section sub frame, etc. The 1995 model was also the last GSX-R750 to feature the traditional aluminium double-cradle frame. 
 

GSX-R 750 1995
Overall Length: 2,110 mm (83.0 in)
Overall Width: 730 mm (28.7 in)
Overall Height: 1,135 mm (44.7 in)
Seat Height: 780 mm (30.7 in)
Wheelbase: 1,435 mm (56.5 in)
Ground Clearance: 130 mm (5.1 in)
Dry Weight: 199 kg (439 lbs)
Engine type: Water-cooled 749 cc inline-4, DOHC, 16 valves. 118 hp (86.1 kW)/ 11,500 rpm, 78,5 Nm/ 9,000 rpm.

Suzuki GSX-R750GSX-R 750 1995
Overall Length: 2,110 mm (83.0 in)
Overall Width: 730 mm (28.7 in)
Overall Height: 1,135 mm (44.7 in)
Seat Height: 780 mm (30.7 in)
Wheelbase: 1,435 mm (56.5 in)
Ground Clearance: 130 mm (5.1 in)
Dry Weight: 199 kg (439 lbs)
Engine type: Water-cooled 749 cc inline-4, DOHC, 16 valves. 118 hp (86.1 kW)/ 11,500 rpm, 78,5 Nm/ 9,000 rpm.



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All the larger motorcycles made for the Japanese home market are power restricted.
Prior to 1993 the maximum horsepower were the following:
  250cc class: 45hp
  400cc class: 59 hp
  750cc class: 77 hp
  over 750cc: not allowed

The new limits for the models built in 1993 and after, were:
  250cc class: 40hp
  400cc class: 53 hp
  750cc class: 77 hp
  over 750cc: allowed, but restricted to 100 hp.

Bikes with more powerful engines are and were made for export only. However, if a Japanese private person wants to buy an unrestricted bike, they are allowed to import it from another country by themselves for private use...


More: GSX-R750 brochures & adverts

More: All Suzuki models

Sources:
http://www.onlygsxr.fsnet.co.uk/history1.html
http://www.adelaide.net.au/~millett/GSXR/gsxrlist.htm


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