The engine power was reduced to 53 horsepower in 1993, according to the revisited power restriction code in Japan. Before 1993, the maximum power for a 400cc class bike was 59 hp. Cosmetic changes. 1993 was the last year for the SP (Sports Production) model.
All the larger motorcycles made for the Japanese home market are power restricted. Prior to 1993 the maximum horsepower were the following: 400cc class: 59 hp. The new limits for the models built in 1993 and after, were: 400cc class: 53 hp.
Although the medium and low speed range was improved by changing the weight and valve timing etc. and changing the valve timing, the maximum output is 53 ps maximum output and 3.8kg-m maximum torque due to change of the self-regulation value and power down on specifications. Headlight turned on at all times.
The SP specification also undergoes the same change as the 1993 model, but the valve timing is not changed, the maximum torque is 3.7kg-m/10000 rpm. The maximum output is the same as the standard. Pearl Suzuki Medium Blue only.
Suzuki GSX-R400 1993 Specifications
Light purple metallic
SP model Pearl Suzuki Medium Blue
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 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
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
Frame type: Aluminum angular pipe double cradle
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
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
Headlight: 12V 35/35w x 2
Power/weight ratio: 2,57 kg/ps
Center stand: Yes
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.
Suzuki GSX-R400 1993 Image Gallery