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Suzuki GSX400E 1979—1987
Suzuki GSX400S 1980—1987


I have tried to tell the Suzuki GSX 400 E model history on this page, as I know it. The page is still under construction. I would be grateful of any contributions — sales brochures, magazine ads, magazine articles, pictures, specs, facts, corrections etc. Please scan the material in JPEG format (large enough that all the details are visible) and send them to me. Please tell me the source and the publication date if possible. If you send me pictures of your own bike, please follow these instructions.

'84 Suzuki GSX400E

Suzuki 1979More Suzuki models from 1979
1979 Suzuki year code: N, GSX400EN, GSX400E-1

The air-cooled twin GSX400E (frame code: GK51C) with four valves per cylinder was released in 1979 in Japan. The style of the middle range street sports bike had the same styling as its smaller brother GSX250E that was presented the following year.
Suzuki GSX400ETSuzuki GSX400E 1979
Overall Length: 2 105 mm (82.9 in)
Overall Width: 750 mm (29.5 in)
Overall Height: 1 140 mm (44.9 in)
Wheelbase: 1 415 mm (55.7 in)
Weight: 175 kg (385 lbs)
Engine type: Air-cooled 398 cc parallel twin, DOHC, 8 valves. 44 hp/ 9.500 rpm, 3,7 kg-m/ 8.000 rpm.

Click on the image for larger format.


Suzuki 1980More Suzuki models from 1980
1980 Suzuki year code: T, GSX400ET, GSX400E-2

The air-cooled twin GSX400E (frame code: GK51C) with four valves per cylinder was presented in Europe in 1980, replacing the GS425 with two valves per cylinder. The style of the middle range street sports bike had the same styling as its smaller brother GSX250E, released simultaneously.

A version with a small cockpit fairing, GSX400S (internal model code: GK53C), was presented in 1980. GSX400ST colors (in France anyway) were: Black (with Red and White stripes) and Metallic Grey (with Red and Black stripes).
Suzuki GSX400ETSuzuki GSX400E 1980
Overall Length: 2 105 mm (82.9 in)
Overall Width: 750 mm (29.5 in)
Overall Height: 1 140 mm (44.9 in)
Wheelbase: 1 415 mm (55.7 in)
Weight: 175 kg (385 lbs)
Engine type: Air-cooled 398 cc parallel twin, DOHC, 8 valves. 44 hp/ 9.500 rpm, 3,7 kg-m/ 8.000 rpm.

Click on the image for larger format.


Suzuki 1981More Suzuki models from 1981
1981 Suzuki year code: X, GSX400EX, GSX400E-3

In 1981 the GSX400E and GSX400ES models got a sister model called GSX400F (four) that had an inline-four DOHC engine and the custom styled GSX400L with the twin engine, all with four valves per cylinder.

Reliability was often on a par with the old and somewhat infamous GSX400E. The engine worked much better in 250 form but such is the reputation of the bigger bike that few made it to Europe.

The 1981 GSX400SX colors (according to French specs) were: Black (with Red and Orange decoration) and White (with Blue decorations).
Suzuki GSX400E GSX400GSX400E 1981
Overall Length: 2 105 mm (82.9 in)
Overall Width: 755 mm (33.5 in)
Overall Height: 1 095 mm (43.1 in)
Wheelbase: 1 415 mm (55.7 in)
Dry Weight: 173 kg (381 lbs)
Engine type: Air-cooled 398 cc parallel twin, DOHC, 8 valves. 44 hp/ 9.500 rpm, 3,7 kg-m/ 8.000 rpm.

Click on the image for larger format.
Here's even larger picture.
Suzuki GSX400ES GSX400SGSX400S 1981
Overall Length: 2 105 mm (82.9 in)
Overall Width: 755 mm (33.5 in)
Overall Height: ?
Wheelbase: 1 415 mm (55.7 in)
Dry Weight:?
Engine type: Air-cooled 398 cc parallel twin, DOHC, 8 valves. 44 hp/ 9.500 rpm, 3,7 kg-m/ 8.000 rpm.

Click on the image for larger format.
Here's even larger picture.


Suzuki 1982More Suzuki models from 1982
1982 Suzuki year code: Z, GSX400EZ, GSX400E-4

The 1982 Katana styled GSX400E was offered in the Katana silver or red. Appart from the "sweet Katana" estetics, there were some technical changes:
1) New ignition fully electronic (previous one had a mechanical centrifugal advance system) and ignition advance goes to 30º from previous 20º
2) Carburation tuned to adapt it to exhaust modifications
3) Electrical fuel tank gauge
4) New frame, special mention to rear swinging arm getting 40 mm longer
5) Steering column strongly triangled, turning on conical bearings
6) Anti-dive front fork
7) Engine cover screws changed from cross to hexicon head
The changes in the motor and cycle parts make it a more consistent and brilliant bike.

Originally the GSX400E was offered with a single disk front brake and a anti-dive system fitted on the left side only. Because of the construction, according to some owners, the front fork felt strange at full braking from high speed. The single disk was good enough for stopping the bike but a version with double-disk and anti-dive system for both sides was available for the GSX400E from 1982 year's model in order to get rid of the odd behavior. I'm afraid I don't know if the double disk version was standard in some countries or if it was a option, the pictures here below shows the both versions.

The 1982 GSX400SZ colors (in France) were Red and Silver Grey.
Suzuki GSX400EGSX400E 1982
Overall Length: 2 105 mm (82.9 in)
Overall Width: 755 mm (33.5 in)
Overall Height: 1 095 mm (43.1 in)
Wheelbase: 1 415 mm (55.7 in)
Dry Weight: 173 kg (381 lbs)
Engine type: Air-cooled 398 cc parallel twin, DOHC, 8 valves. 44 hp/ 9.500 rpm, 3,7 kg-m/ 8.000 rpm.

Click on the image for larger format.
Suzuki GSX400EGSX400E 1982
Overall Length: 2 105 mm (82.9 in)
Overall Width: 755 mm (33.5 in)
Overall Height: 1 095 mm (43.1 in)
Wheelbase: 1 415 mm (55.7 in)
Dry Weight: 173 kg (381 lbs)
Engine type: Air-cooled 398 cc parallel twin, DOHC, 8 valves. 44 hp/ 9.500 rpm, 3,7 kg-m/ 8.000 rpm.
Click on the image for larger format.


Suzuki 1983More Suzuki models from 1983
1983 Suzuki year code: D, GSX400ED, GSX400E-5

In 1983 the GSX400E got new type of cast wheels and a black-coated engine. Probably even the instrument panel got a new design. The paint scheme was new but mechanically the model remained unchanged.

As earlier, a model version called GSX400S with a small fairing was offered for those who wanted some protection against the wind.

Suzuki GSX400ESGSX400S 1983
Overall Length: 2 105 mm (82.9 in)
Overall Width: 755 mm (29.7 in)
Overall Height: 1 095 mm (43.1 in)
Seat Height: 695 mm (27.4 in)
Wheelbase: 1 415 mm (55.7 in)
Dry Weight: 177 kg (390 lbs)
Engine type: Air-cooled 398 cc parallel twin, DOHC, 8 valves. 44 hp/ 9.500 rpm, 3,7 kg-m/ 8.000 rpm.

Click on the image for larger format.



Suzuki 1984More Suzuki models from 1984

1984 Suzuki year code: E, GSX400EE, GSX400E-6

1984 was the last year for the GSX400E in many countries. The GSX400S (GS400S in North America) lived on for a couple of more years. The GSX-R400, the liquid-cooled GSX400FWS and the GSX400X Impulse were other 400 cc four-stroke motorcycles Suzuki had to offer in the mid-eighties.

Suzuki GSX400EGSX400E 1984
Overall Length: 2 105 mm (82.9 in)
Overall Width: 755 mm (29.7 in)
Overall Height: 1 095 mm (43.1 in)
Seat Height: 695 mm (27.4 in)
Wheelbase: 1 415 mm (55.7 in)
Dry Weight: 175 kg (385 lbs)
Engine type: Air-cooled 398 cc parallel twin, DOHC, 8 valves. 44 hp/ 9.500 rpm, 3,7 kg-m/ 8.000 rpm.

Click on the image for larger format.

Suzuki GSX400SGSX400S 1984
Overall Length: 2 105 mm (82.9 in)
Overall Width: 755 mm (29.7 in)
Overall Height: 1 095 mm (43.1 in)
Seat Height: 695 mm (27.4 in)
Wheelbase: 1 415 mm (55.7 in)
Dry Weight: 177 kg (390 lbs)
Engine type: Air-cooled 398 cc parallel twin, DOHC, 8 valves. 44 hp/ 9.500 rpm, 3,7 kg-m/ 8.000 rpm.

Click on the image for larger format.
Here's even larger picture.


'84 Suzuki GSX400S, Germany
1984 GSX400S

Suzuki 1985More Suzuki models from 1985
1985 Suzuki year code: F

In Spain Suzuki introduced GSX400E, and only the E model, starting in 1985 — t oo late to have good sales results; Yamaha had introduced the XS400 with its nice cantilever rear suspension in Spain two years earlier. Anyway, a GSX400E won the '87 Superstreet Spanish Championsip. In this market segment Suzuki Spain imported GSX400E models until 1987. In 1988 the GS450S was imported to Spain — with even less success — and was replaced i n 1989 with the very successful GS500E. Suzuki did not import the GSX400S version in Spain. (many thanks for the info, Eduardo!)



Suzuki 1986More Suzuki models from 1986
1986 Suzuki year code: G


”One shall not change things just because you want to change it”, says the Swedish Suzuki lineup catalog from 1986 about the GSX400E — and shows a picture of the GSX400S without the fairing. Apparently the naked version was still popular in Sweden and the importer wanted to continue selling it in 1986. No naked versions were longer manufactured but the problem was quite easily solved by selling the bike without the bikini fairing...
Suzuki GSX400EGSX400E (GSX400S) 1986
Overall Length: 2 105 mm (82.9 in)
Overall Width: 755 mm (29.7 in)
Overall Height: 1160 mm (45.7 in)
Seat Height: 755 mm (29.7 in)
Wheelbase: 1 420 mm (55.9 in)
Ground Clearance: 145 mm (5.7 in)
Dry Weight: 177 kg (390 lbs)
Engine type: Air-cooled 398 cc parallel twin, DOHC, 8 valves. 44 hp/ 9,500 rpm, 3,7 kg-m/ 8,000 rpm.

Click on the image for larger format.
Here's even larger picture.


GSX400E specifications (Japan)
Overall Length:

2 105 mm (82,9 in.)

Overall Width:

755 mm (29,7 in.)

Overall Height:

1 070 mm (42,1 in.)

Wheelbase:

1 415 mm (55,7 in.)

Road Clearance:

145 mm (5,7 in.)

Seat Height:

755 mm (29,7 in.)

Dry Weight:
175,9 kg (387 lbs)
Turning Radius:

2,4 m (94,5 in.)

Engine type:
Air-cooled 4-stroke, parallel twin
Valves:
DOHC, four valves per cylinder
Cylinder Volume:

399 cc

Bore x Stroke:
67x 56.6 mm
Compression Ratio:
10.5 : 1
Power Output:
44 hp/ 9.500 rpm
Torque:
3,7 kg-m (26,8 ft-lb)/ 8.000 rpm
Carburetor Type:
BS34
Starter System:
Electric starter
Ignition System:
Full transistor
Lubricating Type:
Wet sump
Oil Capacity:

3,0 liter

Gasoline Tank Capacity:

16 liter

Clutch Type:
Wet multiple plates, Coil spring
Transmission Type
6-speed constant mesh

Gear Ratio: 1st gear

2.461

2nd gear

1.777

3rd gear

1.380

4th gear

1.125

5 speed

0.961

6 speed

0.851

Primary Drive Ratio:

2.714

Secondary Drive Ratio:

2.933

Frame Type:
Double Cradle
Caster:

27” 50´

Trail:

102 mm (4,02 in.)

Front Brake Type:

Hydraulic double disk
Rear Brake Type:
Expanding drum brake
Front Tire Size:
3.60S-18 4PR
Rear Tire Size:
4.10S-18 4PR
Steering Angle (left to right):
42°

Comments about the specs:
The French manual for the SZ says the maximum power was 40.9 hp (not 44.0 as in Japan) and a 1985 "Motociclismo"magazine test says the power was 42 hp (refering to Suzuki catalogue data).

The given compression ratio in three different European sources is 10:1 (not 10.5:1 as claimed above). The same sources also say the tyres are 3.00 and. 3.50 wide, not 3.60 and 4.10 as in Japan.

The 1986 Owners Manual for the English, French, German and Dutch versions gives the following measurements for both: Height 1,060 mm (GSX400E) and 1,170 mm (GSX400S) Dry weight: 176 kg (GSX400E) and 177 kg (GSX400S). This is without gasoline, oil and other liquids. As to "full" weight the French study gives for the GS400SZ 191 kg for the E model and 192 kg for the S.




More: GSX400E brochures & adverts

More: Suzuki GSX models

More: All Suzuki models

Sources: Motorcycles on-line, Michael's GS Classic, www.infomadonna.ne.jp/~redking, www04.u-page.so-net.ne.jp/ca2 etc.

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