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Suzuki Motorcycles

Suzuki GSX-R400 1990 Specifications

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In 1990 Suzuki presented a whole new Suzuki GSX-R400 (new internal model code GK76A) with inverted forks and many other modifications. The frame was upgraded from twin spur to double cradle, similar to the 1988 Suzuki GSX-R750 model change.

A new 4 into 1 exhaust increased the engine power close to 60bhp and the engine redlined at 14,500 rpm. Nissin 4-cylinder front brake calipers, new fairing design with faired-in headlights, preload-adjustable forks, unbraced swing-arm, rear hugger mudguard.

1989 Full model change as a direct machine of F-3 champion machine Suzuki GSX-R400R and TTF-1 champion machine Suzuki GSX-R750. The engine which was set to 24 degrees ante leaning by 8 degrees more than the 1989 model is a completely new design.

Especially the valve train system was thoroughly reviewed, and it showed 4.0kgm/10,000rpm by weight saving and adoption of 1 valve 1 rocker arm. The increased heat measures with high performance are supported by water-cooled oil cooler and radial flow radiator. The frame became an aluminum double cradle with the same layout as the TTF-1 machine and durable racer, and the inverted mode was adopted for the front fork.

Suzuki GSX-R400 1990 Specifications

Colors
Blue/White
Silver
SP model Blue/White

Dimensions and dry mass
Type (frame code): GK76A
Overall length: 1,995 mm (78.5 in.)
Overall width: 710 mm (28.0 in)
Overall height: 1,060 mm (41.7 in)
Wheelbase: 1,435 mm (56.5 in)
Ground Clearance: 125 mm (4.92 in.)
Seat height: 735 mm (28.9 in.)
Dry mass (weight): 167 kg (367 lbs)

Engine
Engine type: Water-cooled DOHC inline-4, 16 valves
Bore x stroke: 56,0 mm x 40,4 mm (2.205 x 1.591 in.)
Piston displacement: 398 cc
Compression ratio: 11,8 :1
Maximum power: 59 hp/ 12,000 rpm
Maximum torque: 4,0 kg-m/ 10,000 rpm
Top speed: about 200 km/h (124 mph)
Starting system: Electric starter
Lubrication system: Wet sump
Carburetor: Mikuni 27mm x 2

Transmission
Clutch type: Wet multi-plate
Transmission type: 6 speeds, chain drive
Gearshift pattern: 1-down, 5-up
Primary reduction ratio: 2.212
1st gear ratio: 3.166
2nd gear ratio: 2.125
3rd gear ratio: 1.631
4th gear ratio: 1.333
5th gear ratio: 1.173
6th gear ratio: 1.083
Final drive: 3.066 chain

Chassis
Frame type: Aluminum angular pipe double cradle
Caster: 25º
Trail: 101 mm (4.0 in.)
Front suspension: Telescopic, coil spring, oil dampened with anti-dive
Rear suspension: Full floater suspension system, spring pre-load fully adjustable, oil dampened
Front brake: Dual hydraulic disc, four piston calipers
Rear brake: Single hydraulic disc, dual piston calipers
Front tire dimensions: 120/60-17
Rear tire dimensions: 160/60-17

Electrical
Ignition type: fully transistorized
Ignition timing: 15º BTDC below at 1650 r/min and 35º BTDC above 3.500 r/min
Spark plug: ND U24FS-U or NGK C8HA
Battery: 12V 39.6 kC (11Ah)/10HR
Generator: Three-phase A.C. Generator
Fuse: 20A
Headlight: 12V 35/35w x 2
Power/weight ratio: 2,57 kg/ps
Center stand: Yes

Capacities
Fuel tank: 18 l.
Reserve: 3.5 l.
Engine oil: 2.6 l.
Front fork oil (each leg): 397 ml.
Cooling solution: 2,185 ml.

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Suzuki GSX-R400 1990 Specifications
Suzuki GSX-R400 1990 Specifications
Suzuki GSX-R400 1990 Specifications
Suzuki GSX-R400 1990 Specifications
Tags: 1990400GSX-RSuzuki GSX-RSuzuki GSX-R 400Suzuki GSX-R 400 1990Suzuki GSX-R400
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