In 1989 an extra ”R” was added to the model name. The new model name was Suzuki GSX-R400R although the internal model code (frame code) remained the same.
A Production Racer version, Suzuki GSX-R400R SP, was released in June 1989 with single seat, close ratio gear box, uprated suspension and different CDI.
Suzuki GSX-R400 1989 Specifications
Colors Blue/White Red/Silver Black/Gray SP model Blue/White SP model Black
Dimensions and dry mass Type (frame code): GK73A Overall length: 1,995 mm (78.5 in.) Overall width: 695 mm (27.4 in.) Overall height: 1,110 mm (43.7 in.) Wheelbase: 1,375 mm (54.1 in.) Ground Clearance: 125 mm (4.92 in.) Seat height: 735 mm (28.9 in.) Dry mass (weight): 160 kg (352 lbs)
Engine Engine type: Liquid-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: 38 Nm (3,9 kg-m)/ 10,500 rpm Top speed: about 200 km/h (124 mph) Starting system: Electric starter Lubrication system: Wet sump Carburetor: Mikuni 27mm x 2