Suzuki 1990 Year code : L,GSX-R400RL
In 1990 Suzuki presented a whole new 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 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.
GSX-R400R 1990
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)
Dry Weight: 167 kg (367 lbs)
Engine type: Water-cooled 398 cc inline-4, DOHC, 16 valves. 59 hp/12,500 rpm, 4,0 kg-m/ 10,000 rpm.
GSX-R400R 1990
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)
Dry Weight: 167 kg (367 lbs)
Engine type: Water-cooled 398 cc inline-4, DOHC, 16 valves. 59 hp/12,500 rpm, 4,0 kg-m/ 10,000 rpm.
   
GSX-R 400 SP 1990
Overall Length: 1,995 mm (78.5 in)
Overall Width: 710 mm (28.0 in)
Overall Height: 1,060 mm (41.7 in)
Wheelbase: 1,375 mm (54.1 in)
Dry Weight: 167 kg (367 lbs)
Engine type: Water-cooled 398 cc inline-4, DOHC, 16 valves. 59 hp/12,000 rpm, 3,9 kg-m/ 10,500 rpm.
1991 Suzuki year code: M, GSX-R400RM, GSX400RFM, GSX400RFNM
Redesigned brake discs and new painting, otherwise pretty much the same design as in 1990. The rear shocks with gas reservoir that were mounted in the '90 year's SP (Sports Production) were now fitted even in the standard model (visible above the rear axle). Adjustable brake lever and a steering damper included.
GSX-R400R 1991
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)
Dry Weight: 167 kg (367 lbs)
Engine type: Water-cooled 398 cc inline-4, DOHC, 16 valves. 59 hp/ 12,500 rpm, 40 Nm/ 10,000 rpm.
GSX-R400R SP II 1991
Overall Length: 1,995 mm (78.5 in)
Overall Width: 710 mm (28.0 in)
Overall Height: 1,060 mm (41.7 in)
Wheelbase: 1,375 mm (54.1 in)
Dry Weight: 167 kg (367 lbs)
Engine type: Water-cooled 398 cc inline-4, DOHC, 16 valves. 59 hp/12,500 rpm, 40 NM/ 10,000 rpm.
1992 Suzuki year code: N, GSX-R400RN, GSX400RFN
Cosmetic changes only. 1992 was the last year for the SP-II model to be prepared. It was also the last year with the stronger 59 horsepower engine.
GSX-R400R 1991
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)
Dry Weight: 167 kg (367 lbs)
Engine type: Water-cooled 398 cc inline-4, DOHC, 16 valves. 59 hp/ 12,500 rpm, 40 NM/ 10,000 rpm.
   
GSX-R 400 SP 1992
Overall Length: 1,995 mm (78.5 in)
Overall Width: 710 mm (28.0 in)
Overall Height: 1,060 mm (41.7 in)
Wheelbase: 1,375 mm (54.1 in)
Dry Weight: 167 kg (367 lbs)
Engine type: Water-cooled 398 cc inline-4, DOHC, 16 valves. 59 hp/12,500 rpm, 40 NM/ 10,000 rpm.

1993 Suzuki year code: P, GSX-R400RP, GSX-R400RFP


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:
  250cc class: 45hp
  400cc class: 59 hp
  750cc class: 77 hp
  over 750cc: not allowed

The new limits for the models built in 1993 and after, were:
  250cc class: 40hp
  400cc class: 53 hp
  750cc class: 77 hp
  over 750cc: allowed, but restricted to 100 hp.
GSX-R 400 R 1993
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)
Weight: 169 kg (372 lbs)
Engine type: Water-cooled 398 cc inline-4, DOHC, 16 valves. 53 hp/ 12,000 rpm, 3.8 kg-m/ 9,500 rpm.
GSX-R 400 R SP 1993
Overall Length: 1,995 mm (78.5 in)
Overall Width: 710 mm (28.0 in)
Overall Height: 1,060 mm (41.7 in)
Wheelbase: 1,375 mm (54.1 in)
Weight: 169 kg (372 lbs)
Engine type: Water-cooled 398 cc inline-4, DOHC, 16 valves. 53 hp/ 12,000 rpm, 3,7 kg-m/ 10,000 rpm.

1994 Suzuki year code: R, GSX-R400RR, GSX400RFR
New graphics, otherwise pretty much the same bike as in 1993.
Sorry, no pictures available for the moment.
1995 Suzuki year code: S, GSX-R400RS, GSX400RFS
Redesigned brake discs, otherwise pretty much the same racer replica as for 1990.
GSX-R400R 1995
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)
Dry Weight: 169 kg (472 lbs)
Engine type: Water-cooled 398 cc inline-4, DOHC, 16 valves. 53 hp/ 12,000 rpm, 3,8 kg-m/ 9,500 rpm.
GSX-R400R 1995
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)
Dry Weight: 169 kg (472 lbs)
Engine type: Water-cooled 398 cc inline-4, DOHC, 16 valves. 53 hp/ 12,000 rpm, 3,8 kg-m/ 9,500 rpm.