The Suzuki GSX-R750 1985 weighed in at a mere 179kg. Mounted on an aluminum double-cradle frame dubbed the MR-ALBOX, the 4-cylinder DOHC engine used the Suzuki Advanced Cooling System (SACS), cooled by forcibly pumping in oil. With tuning by companies such as Yoshimura, the GSX-R750 turned in spectacular performances at both domestic and overseas circuits.
The 1985 model featured a lightweight aluminum alloy frame, flatslide carbs, twin discs with 4-pot calipers and 18 inch tires both front and rear. An oil-cooled engine was made to save weight as compared with the heavier water-cooled engines of the time.
With the introduction of the 1983 Suzuki RG250 Gamma, Suzuki was the first manufacturer to bring a true racer replica using race-bred technology to the public. With the RG250 Gamma a success, the next step was to build a 4-stroke 400cc machine for the Japanese home market and a year later a 750cc machine, with the Suzuki’s racing experiences in the World Endurance, AMA Superbike and Championship. At the 1984 IFMA Cologne Show in West Germany the GSX-R750 was introduced; a street legal bike with a design to compete in the various Worldwide Championships. It would go on sale in March 1985.
In Suzuki GSX-R 750 1985 offered race-bred technology and performance at an affordable price. The design philosophy centered mainly on weight reduction. Suzuki went counter to the conventional engine design by developing a computer designed packed with SACS (Suzuki Advanced Cooling System) where the cylinder head and the pistons are oil cooled via the engine oil injection, achieving cooling efficiency as good as water-cooling with 10% weight decrease.
The Suzuki GSX-R 750 1985 also featured DAIS (Direct Air Intake System), TSCC (Twin Swirl Combustion Chamber) cylinder head, flat side carburetors, six-speed gearbox and hydraulic clutch. The chassis offered multi-rib extrusion molded aluminum box section piping and cold-cast aluminum alloy components, MR-ALBOX frame (that weighted 8,1 kg less than half of the conventional steel frames). These and other weight reduction measures gave the bike a low dry weight of 179 kg, 20% lower than the competing 750s, resulting a superior power-to-weight ratio for much easier power control and quicker handling. Completing the GSX-R750 design was the endurance racer theme: dual headlights on the aerodynamics full fairing and 18-inch tyres both front and rear.
A revolutionary motorcycle with specifications like having more than 100 horsepower, less than 180 kg dry, 55° angle, light alloy frame double cradle perimeter, 18-inch wheels, an aerodynamic design based on Formula 1 and on motorbikes resistance.
The cooled air / oil engine oil had dimensions of 70.0 × 48.7 mm and 29 mm carburetors. The Suzuki GSX-R 750 1985 had a 130 hp engine, high technology, narrower than the previous four online and materials like magnesium were used to reduce weight to a minimum.
The Suzuki GSX-R 750 1985 was basically a version of “decaffeinated” Suzuki motorcycle street racing GS1000R. Flat slide carburetors gave faster acceleration, response compared to vacuum carburetors. They also required that the pilot was smoother with the throttle. It was very quick in the hands of a skilled pilot, but could be seen as nervous and even dangerous for inexperienced pilots.
The Suzuki GSX-R 750 1985 entered the international market in March 1985, although it was first introduced at the IFMA, Sample Cologne, Germany, in 1984. The evolution of modern sports bikes started with the Suzuki GSX-R 750 1985. This is a true classic.
Suzuki GSX-R750 1985 Specifications
Suzuki year code
1985: F
Colours
Super White / Champion Blue (7GF)
Black / Pearl Twinkle Red (7JK)
Dimensions and curb weight
Overall length: 2,130 mm (83.9 in)
Overall width: 620 mm (24.4 in)
Overall height: 1,200 mm (47.2 in)
Seat height: 755 mm (29.7 in)
Wheelbase: 1,425 mm (56.1 in)
Ground clearance: 140 mm (5.5 in)
Empty weight: 176 kg (388 lbs)
Engine
Engine Type: 4 stroke, air and oil cooled, DOHC
Type: GR71G
Number of cylinders: 4 cylinders
Calibre: 70.0 mm (2.756 in)
Stroke: 48.7 mm (1.917 in)
Displacement: 747 cc (45.7 cu in.)
Torque: 64 Nm / 8,000 rpm.
Power: 106 hp (77.4 kW) / 10,500 rpm
Compression: 9.8: 1
Carburetor: Mikuni 29mm 4x
Air filter: Paper element
Starting system: Electric
Lubrication system: Wet Carter
Drivetrain
Clutch: Wet, multiplate oil
Transmission: 6-speed constant Gear
Gearshift pattern: 1 reduction, 5x
Primary reduction ratio: 1.744 (75/43)
Gear Ratio:
First: 2,866 (43/15)
2nd: 2,058 (35/17)
3rd: 1,650 (33/20)
4th: 1,428 (30/21)
5th: 1,260 (29/23)
High: 1,120 (28/25)
Final reduction ratio: 2.800 (42/15)
Drive chain: RK TAKASAGO 50GSVZ1 or DAIDO DID 50VA7, 108 links
Chassis
Front suspension: Telescopic, coil springs, adjustable preload, damping oil, 4 and 4 compression settings rebound damping adjustments.
Rear suspension: articulated type, coil, adjustable spring preload, 4 positions, Suzuki “Full Floater” system.
Fork travel: 120 mm (4.7 in)
Rear wheel travel: 136 mm (5.35 in)
Steering angle: 30 °
Caster angle: 65º 30 ‘
Filmed: 94 mm (3.7 in)
Turning radius: 3.1 m (10.2 ft)
Front brakes: Double disc brake
Rear brake: single disc brake
Front Tire Size: 110/80-VR18 V240 radial
Rear Tire Size: 140/70-VR18 V240 radial
Electrical Equipment
Ignition Type: Electronic ignition (Transistorized)
Ignition timing: 7th BTDC at 1500 rpm
Spark plug: NGK CR10EK
Battery: 12 V 36.0 kC (10 Ah) / 10 HR
Generator: Three-phase AC generator
Main fuse: 30A
Fuse: 15/15/15/10/10 A
Headlight: 12 V 60 / 50W x 2
Flashing light 12 V 21 W
Light: 12 V 5 W
Brake / Rear: 12 W x 2 5/21 V
Speedometer Light: 12V 1.7W
Light Tachometer: 12V 1.7W x 2
Neutral indicator light: 14V 3W
Indicator light beam: 14V 3W
Indicator light turn signal: 14V 3W
Oil pressure indicator light: 14V 3W
Capabilities
Fuel tank, including reserve: 21 l (5.5 US / Imp gal)
Engine oil:
oil change: 3,000 ml (3.2 / 2.6 US / Imp qt)
with filter change: 3.300 ml (3.5 / 2.9 US / Imp qt)
Repair: 3.900 ml (4.1 / 3.4 US / Imp qt)
Fork oil 419 ml (14.2 / 14.8 US / Imp oz)
Refrigerant: 2,550 ml (2.7 / 2.2 US / Imp qt)
Suzuki GSX-R750 1985 Image Gallery
