Suzuki GSX-R400 SP

Suzuki GSX-R 400

Make Model	Suzuki GSX-R 400 SP
Year	1986
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.