Suzuki GSX-R750
The Suzuki GSX-R750 is a sports motorcycle made by Suzuki since 1984. It was introduced at the Cologne Motorcycle Show in October 1984 as a motorcycle of the GSX-R series for the 1985 model year.
Air and oil cooled
The air and oil-cooled models can be divided into the first-generation and the second-generation colloquially referred to as 'slabbies' and 'slingshots' respectively. The 1985-1987 models featured very flat bodies compared to modern sport-bikes, hence the term 'slab-sided'. 1988-1991 models are sometimes referred to as slingshots because the carburetors introduced in 1988 were marketed as slingshot carburetors.GSX-R750 (F) 1985 (The Classic)
The original model featured a lightweight aluminum alloy frame, flat slide Mikuni VM29SS carburettors, twin discs with 4-pot calipers, and tyres both front and rear. To save weight, the designers specified an air-and-oil-cooled engine, rather than a water-cooled engine. The seat has separate front and rear sections but from 1986 onwards all models have a one-piece seat.GSX-R750 (G) 1986
The 1986 model received a 25 mm longer swing arm to improve the handling. Apart from a modified belly pan and upgraded headlamps, there is very little difference between the 1985 and 1986 models, other than the introduction of Mikuni CV carbs on some markets. 1986 is the first year the model was introduced to the US.GSX-R750R 1986
The Racing homologation Limited Edition model. 500 were manufactured worldwide, with 199 made for the US, 20 for Canada and 150 for the Japanese market. Its $6,499.99 retail price was 40% more expensive than the standard model, making it the most expensive Japanese sport-bike money could buy that year. Unique items that differentiate this model from the standard model include a dry clutch system, close-ratio 6 speed transmission, 29mm flat-slide carbs, 19L steel gas tank, hand-laid fiberglass solo rear section with single racing seat, side bodywork utilizing Dzus quick release fasteners and Limited-Edition graphics.The distinctive clutch and actuator housing along with the sprocket cover are all made of magnesium for reduced weight. The clutch actuation is uniquely cable operated rather than hydraulic, offering greater feel and lighter weight. Suspension features the 1986 GSX-R1100's electronically controlled 41mm NEAS anti-dive forks, rims, brake calipers & larger 310mm floating discs, specially designed front brake hoses, a unique "3 point" steering damper and broader clip on handlebars. Out back, a 1" longer swingarm is fitted with threaded inserts for a racing style paddock stand, and an aluminium-bodied shock absorber with remote gas-charged reservoir. Other features found only on this model include a gold plated chain, uniquely patterned exhaust heat shield, premium aluminum exhaust hanger, heal guards, chain guard, bar-end weights, adjustable clutch lever, a visually machined top triple clamp and changes to the bodywork to improve cooling. To seal the deal, included with the purchase were 2 complete sets of racing numbers.
There were two variants of the 1986 GSXR750 Limited Edition. One version was released in the US, Europe and Canada and another was for the Japanese market. The Japanese version had red and gray graphics, along with a fuel gauge, headlight kill switch, tinted turn signal lenses, Japanese-spec city lights, and a black four-into-one "Ray Gun" exhaust system. The non Japanese variant came in a red, white and blue livery, did not have the Japan only items and sported an exhaust pipe with an aluminum heat shield.
GSX-R750 (H) 1987
The 1987 model received upgraded 41 millimeter front forks with NEAS from the previous year's RR and a steering damper was fitted as standard. The fuel tank capacity was increased to 21 liters.GSX-R750 (J) 1988
First major revision. New chassis design, engine revisions, and bodywork. Introduction of a new short-stroke version of the oil-cooled engine, now displacing 748 cc. The engine had 73 millimeter bore and 44.7 millimeter stroke and could achieve higher engine speeds. Internal engine dimensions changed to accommodate the new bore and stroke. This engine used larger valves and carburetors than in previous years. Mikuni model BST36SS 'Slingshot' carbs were 36 millimeter diameter and featured vacuum operated slides; the slide cross section resembled the shape of a slingshot. A four spring clutch was used on the short stroke motor. New styling, and twin black silencers. Wheels were now a diameter, three-spoke design, and used a 160/60VR17 in the rear and 120/70VR17 in the front. Slingshot graphic first appeared on the bodywork. Forks now used a cartridge design and were 43 millimeter in diameter. The second-generation model was heavier than the first but had a stiffer frame and more power.GSX-R750 (K) 1989
Minor changes such as modified lower bodywork, changes to graphics, and silver exhaust silencers. Magazines reported that the exhaust manifold now featured small chamfers on the collector for increased ground clearance. Cycle magazines also reported a change to the rear shock mounting geometry and front fork length to improve ground clearance. Graphics/paint schemes varied slightly between global markets. US models were available in blue/white and red/white schemes. The SACS acronym decal, located on the lower bodywork of the blue/white models, changed from a diagonal lettering to a straight lettering.GSX-R750RK 1989
The GSX-R750RK, also known as the RR, was a limited edition a version first produced in 1989. Out of 500 made, 200 went to Europe and none to the US. Limited edition racing homologation model. The redesigned engine reverted to the original long-stroke configuration. The crankcase, crankshaft connecting rods, and clutch were upgraded to serve as a ready to race platform. The RR also received new 40 millimeter Slingshot carbs and 4-into-1 exhaust pipe, close-ratio gearbox, braced rear swing arm, single-seat unit, and 19 liter aluminum fuel tank. Only 150 were sold in the U.S.GSX-R750 (L) 1990
Although this model looks very similar to the previous '89 model many changes were made. The 90 models featured changes to the engine, suspension, bodywork, brakes, and chassis. This was the first GSX-R to be fitted with inverted forks as standard and returned to the bore and stroke of the original long-stroke engine.The engine returned to the 749 cc engine bore and stroke dimensions of the original long-stroke engine but still maintained the 13,000 rpm redline. It now featured an mm valve and used larger carburetors.
The new Mikuni model BST38SS carburetors were 38 mm diameter and featured an additional "Powerjet" high-speed circuit that was used to fine-tune fuel mixture from 10,000 rpm to the rev limiter. In the unrestricted USA bikes, the Powerjet circuit was jetted with a "zero" sized jet and activating the circuit simply required replacing the "zero" jet with a #57.5 to #62.5 jet. All other worldwide bikes with the 38 millimeter carbs came equipped with a functioning Powerjet circuit.
The slide breathers were now divorced from the airbox.
The exhaust system was also changed, gone were the dual silencers and replaced with one stainless steel silencer on the right side. The transmission output shaft was lengthened to accommodate a wider wheel. A new curved oil-cooler design and oil lines were installed.
The frame was changed for 1990 and used some of the features from the 1989 GSX-R 1100 frame. The rake was now 25.5 degrees and wheelbase. The front suspension now had inverted forks, the triple clamps, and handlebars were changed to accommodate the new forks. The rear suspension featured a new damper and swingarm. The rear damper now had a remote reservoir and damping adjustment. The revised swingarm now featured cast ends for the axle adjustment. The rear wheel was widened to but the tire size remained the same. A non-adjustable steering damper was added which attached from the left frame rail to a clamp on the left fork. The rear sprocket carrier and sprocket changed to a six-bolt design. The front brake rotors changed to a slotted design.
The bodywork changed slightly also. The side vents became less rectangular and in a slightly different position. Anew fender was also used with the inverted forks.
GSX-R750 (M) 1991
The '91 GSX-R750M gained 15 kg over the previous model. The most notable feature of the " M " are the faired in headlamps and a slanted nose, both of which were designed to reduce drag. Also fitted was a new larger seat and new rear bodywork that featured twin tail lamps. This was the last GSX-R to use the oil-cooled SACS engine. Internal engine changes included a new valvetrain that used one dedicated cam lobe and rocker arm per valve. Valve clearance was now adjusted with shims. The cam duration and indexing changed slightly as well as the porting according to a magazine article. The rear tire width was increased to a 170 millimeter section width. The gauges also changed to white-colored needles.GSX-R750 (N) 1992 Oil Cooled
1992 US models are the same as the 1991 with different paint and graphics. All other markets got the new water-cooled GSX-R 750.Mikuni Carburetor 36