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Suzuki GSX-R 400

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Make Model

Suzuki GSX-R 400

Year

1985

Engine

Four stroke, transverse four cylinder, DOHC 4 valves per cylinder. TSCC

Capacity

398 cc / 24.3 cu-in
Bore x Stroke 53 x 45.2 mm
Lubrication Wet sump
Cooling System Liquid cooled
Compression Ratio 11.5:1

Induction

2 x AS27VW carburetors

Ignition 

CDI
Headlight 12V 35/35w x 2
Starting Electric

Max Power

44 kW / 59 hp @ 11000 rpm

Max Torque

39.2 Nm / 4.0 kgf-m / 28.9 lb-ft @ 9000 rpm
Clutch Wet multi-plate

Transmission 

6 Speed, constant mesh
Final Drive Chain
Primary Reduction Ratio 2.212
Final Drive Ratio 3.066
Gear Ratio 1st 3.166 / 2nd 2.125 / 3rd 1.631 / 4th 1.333 / 5th .173 / 6th 1.083
Frame Aluminum angular pipe double cradle

Front Suspension

Telescopic forks

Rear Suspension

Full floater swing arm, non-adjustable

Front Brakes

2 x Discs, 4 piston calipers

Rear Brakes

Single disc, 2 piston caliper

Front Tyre

110/90-16

Rear Tyre

140/90-18
Rake 27° 25'
Trail 96 mm / 3.7 in
Dimensions Length 2090 mm / 82.3 in
Width     710 mm / 28.0 in
Height  1185 mm / 46.7 in
Wheelbase 1425 mm / 56.1 in
Seat Height 780 mm / 30.7 in

Dry Weight

152 kg / 334 lbs

Fuel Capacity 

15 Litres / 3.96 US gal / 3.3 Imp gal

The GSX-R400 (initially called GSX-R in Japan, internal model code GK71B) was released in March 1984. It was the first mass-produced light-weight racer replica with an aluminum cradle frame and a liquid-cooled inline-four DOHC engine with four valves per cylinder. The, in those days, amazing machine was based on Yoshimura's TT-F3 racer GS1000R. The competitors, Yamaha FZ400R and Honda CBR400R were 13—31 kg (29—68 lbs) heavier than the new and quick GSX-R.

Compared to other bikes of the time, the GSX-R400 was very light and the 4-piston brakes at the front and the 2-piston rear brake was more than adequate for the 152 kg (334 lbs) light street racer. The bike was quick to handle, the engine with 4-1 exhaust system was powerful for its size and made the GSX-R the fastest bike in its class. With the maximum power output 59 hp and 152 kg (334 lbs( dry mass, the power/weight ratio (2,57 kg/hp) was even better than Suzuki's incredible 2-stroke racer, RG250 Gamma. The GSX-R400 started a new era, it was the fastest and best-handling 400cc bike ever made.

The water-cooled inline-four four-stroke had double overhead camshafts and four valves per cylinder. The GSX400FW (presented the previous year) had the same principal engine specs but lower power output and the GSX-R400's new engine with its 66 kg (145 lbs) was 10 kg (22 lbs) lighter. 12,000 maximum revs.