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Suzuki GS400 1976—1979
Suzuki GS400E
1978—1984
Suzuki GS400L
1979—1986
Suzuki GS400T
1981—1983
Suzuki GS400X
1977—1978
Suzuki GS400E
1991


I have put some Suzuki GS400E info on this page. Please send me more stuff to put here. I want brochures and adverts from all over the world!


Suzuki GS400

The Suzuki GS400 twin was presented in October 1976, being one of the first four-stroke Suzukis since the Colleda COX in the 1950's. The other Suzuki four-strokes that were introduced that year were the GS750 and GS550 fours. All three of them had similar appearance and specification other than the GS400 had a cross-mount inline twin, six-speed gearbox and drum rear brake. The 550cc and 750cc versions had five speeds and disc brakes front and rear. All GS models had two valves per cylinder, double overhead camshafts, tubular double craddle frame, telescopic front and pivoted-fork rear suspension, fuel gauge, gear indicator and electric start.

Although Suzuki had earlier been known as the home of two-strokes and for years let other manufacturors go ahead with their complicated and not-always-that-reliable four-strokes. Honda presented its CB750 already in the late sixties being a emmidiate success. Suzuki's answer, in form of the great new two-strokes in the T and later in the GT family were great bikes in the early seventies but were soon hopefully out-of-date. When even the RE5 with rotary engine turned out to be unsuccesful, it was time for Suzuki to think again. New harder emission regulations were arriving in the USA killing the eventual plans of making even more powerful two-stroke machines. No, Suzuki had to swallow its pride and go with the flow. The name of the game was four-stroke.

With the new four-strokes Suzuki showed that the firm had no problems with that engine type. In fact, the new engine family was conventional and based on established practice but carefully refined to meet or beat the older rivals. The Suzuki GS engines received soon a reputation being strong and reliable with great gearboxes, GS400 engine being no exception.

Suzuki 1976More Suzuki models from 1976
Suzuki model year code: A
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The first generation of the 1970's Suzuki four-strokes. The first version of the GS400 had 34 hp while the power output was soon increased to 37 hp. The power output was restricted to 27 hp in Germany by camshaft modification. A cheaper model without the front disc brake, electric starter and gear indicator was sold in some countries under model name GS400XB.

1976 Suzuki GS400 colors: Red and Blue
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GS400 GS-400 GS400A GS-400A1976 Suzuki GS 400
Overall Length: 2 090 mm (82.3 in)
Overall Width: 835 mm (32.9 in)
Overall Height: 1 125 mm (44.3 in)
Seat Height: 780 mm (30.7 in)
Wheelbase: 1 385 mm (54.5 in)
Ground Clearance: 155 mm (6.1 in)
Dry Weight: 185 kg (407 lbs)
Engine: Air-cooled 398 cc inline-4, DOHC, 8 valves. 36 hp (26.86 kW) @ 8 500 rpm, 29 Nm (2.8 kg-m) @ 6 600 rpm
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GS400 GS-400 GS400A GS-400A1976 Suzuki GS 400
Overall Length: 2 090 mm (82.3 in)
Overall Width: 835 mm (32.9 in)
Overall Height: 1 125 mm (44.3 in)
Seat Height: 780 mm (30.7 in)
Wheelbase: 1 385 mm (54.5 in)
Ground Clearance: 155 mm (6.1 in)
Dry Weight: 185 kg (407 lbs)
Engine: Air-cooled 398 cc inline-4, DOHC, 8 valves. 36 hp (26.86 kW) @ 8 500 rpm, 29 Nm (2.8 kg-m) @ 6 600 rpm
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Click on the image for larger format.

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GS400 GS-400 GS400A GS-400A1976 Suzuki GS 400
Overall Length: 2 090 mm (82.3 in)
Overall Width: 835 mm (32.9 in)
Overall Height: 1 125 mm (44.3 in)
Seat Height: 780 mm (30.7 in)
Wheelbase: 1 385 mm (54.5 in)
Ground Clearance: 155 mm (6.1 in)
Dry Weight: 185 kg (407 lbs)
Engine: Air-cooled 398 cc inline-4, DOHC, 8 valves. 36 hp (26.86 kW) @ 8 500 rpm, 29 Nm (2.8 kg-m) @ 6 600 rpm

Click on the image for larger format.

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Suzuki 1977More Suzuki models from 1977
Suzuki model year code: B
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Some of the pictures I've seen of the 1976-year's model, the motorcycle appeared to have smaller front brake disc thatn the later model. That may be a prototype or very early bersion of the Suzuki GS400. There should be no differencies between the 1976 and 1977 models.

A cheaper model without the front disc brake, electric starter and gear indicator was sold in some countries under model name GS400X. A noticable difference, apart from the front brake, is the Chrome lower steering stem cover.

GS400XB initial frame number: GS400X-10001
GS400XB initial engine number: GS400X-10001
Color: Blue
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GS-400 GS400B GS-400B GS400 street bike1977 Suzuki GS 400
Overall Length: 2 080 mm (81.9 in)
Overall Width: 835 mm (32.9 in)
Overall Height: 1 125 mm (44.3 in)
Seat Height: 780 mm (30.7 in)
Wheelbase: 1 385 mm (54.5 in)
Dry Weight: 172 kg (378 lbs)
Engine: Air-cooled 398 cc inline-4, DOHC, 8 valves. 36 hp (26,86 kW) @ 8 500 rpm, 33 Nm (3.2 kg-m) @ 7 6000 rpm

Click on the image for larger format.
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1977 GS400 (GK79A) specifications (Finland)
Engine: Air-cooled DOHC inline-two 4-stroke
Cylinder Volume: 398 cc
Bore x Stroke: 65.0 x 60.0 mm
Compression Ratio: 9,0 :1
Power output: 34 hp (25,4 kW) @ 8 000 rpm
Torque: 30 Nm (2,94 kpm) @ 7 6000 rpm
Carburetor: Mikuni BS34 x 2
Air filter type: Oil-soaked foam
Ingintion system: Conventional type (non-transistor)
Recommended fuel: Unleaded or low-lead
Fuel Tank Capacity: 14 liter incl. reserve
Reserve: 1,5 liter
Oil capacity: 2,1 liter
Overall Length: 2 085 mm (82.1 in.)
Overall Width: 840 mm (33.1 in.)
Overall Height: -
Wheelbase: 1 385 mm (54.5 in)
Seat Height: 790 mm (31.1 in.)
Ground Clearance: 170 mm (6.7 in.)
Dry Weight: 172 kg (378 lbs)
Transmission: 6-speed Constant Mesh
Primary Drive Ratio: 2.714
Final Drive Ratio: 2.461
1st Gear Ratio: 2.461
2nd Gear Ratio: 1.777
3rd Gear Ratio: 1.380
4th Gear Ratio: 1.125
5th Gear Ratio: 0.961
6th Gear Ratio: 0.851
Clutch type: Wet multi-plate type
Starting system: Electric, kick
Frame type: Tubural double craddle
Front suspension: Telescopic, coil spring, oil damped
Rear suspension: Swing arm, coil spring (5-way adjustable), oil damped
Front tire size: 3.00-18 4PR
Rear tire size: 3.50-18 4PR
Wheel type: Steel rime, wire wheels, aluminum center
Front Brake: Single hydraulic disc (175 mm)
Rear Brake: Internal expanding (185 mm)
Fuel Consumption (measured): 4,6—6,2 liter/100km (average 5,0 l/100 km)
Suggested Retail Price (Finland): 10,900 FIM



Suzuki 1978More Suzuki models from 1978
Suzuki model year code: C
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A model with casted wheels, GS400E, was released in 1978.
The 1978 GS400 (with wire wheels) looked almost the same as before, but had striping on the fuel tank and the tail piece cowl.

A cheaper model without the front disc brake, electric starter and gear indicator was sold in some countries under model name GS400X. Drum brakes, kick start only. The GS400X was discontinued after 1978.

GS400XB initial frame number: GS400X-13045
GS400XB initial engine number: GS400X-13354
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GS400 GS-400 motorcycle1978 Suzuki GS 400
Overall Length: 2 080 mm (81.9 in)
Overall Width: 835 mm (32.9 in)
Overall Height: 1 125 mm (44.3 in)
Seat Height: 780 mm (30.7 in)Wheelbase: 1 385 mm (54.5 in)
Dry Weight: 172 kg (378 lbs)
Engine: Air-cooled 398 cc inline-4, DOHC, 8 valves. 36 hp (26,86 kW) @ 8 500 rpm, 33 Nm (3.2 kg-m) @ 7 6000 rpm
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Click on the image for larger format.
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GS400 GS-400 motorcycle1978 Suzuki GS 400
Overall Length: 2 080 mm (81.9 in)
Overall Width: 835 mm (32.9 in)
Overall Height: 1 125 mm (44.3 in)
Seat Height: 780 mm (30.7 in)Wheelbase: 1 385 mm (54.5 in)
Dry Weight: 172 kg (378 lbs)
Engine: Air-cooled 398 cc inline-4, DOHC, 8 valves. 36 hp (26,86 kW) @ 8 500 rpm, 33 Nm (3.2 kg-m) @ 7 6000 rpm

Click on the image for larger format.
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Suzuki 1979More Suzuki models from 1979
Suzuki model year code: N
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Suzuki GS400E GS-400E1979 Suzuki GS 400 E
Overall Length: 2 080 mm (81.9 in)
Overall Width: 835 mm (32.9 in)
Overall Height: 1 125 mm (44.3 in)
Seat Height: 780 mm (30.7 in)
Wheelbase: 1 385 mm (54.5 in)
Dry Weight: 172 kg (378 lbs)
Engine: Air-cooled 398 cc inline-2, DOHC, 4 valves. 37 hp @ 9 000 rpm, 34 Nm (3.3 kg-m) @ 7 500 rpm

Click on the image for larger format.
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Suzuki GS400E1979 Suzuki GS 400 E II
Overall Length: 2 090 mm (82.3 in)
Overall Width: 835 mm (32.9 in)
Overall Height: 1 100 mm (43.3 in)
Seat Height: 785 mm (30.9 in)
Wheelbase: 1 385 mm (54.5 in)
Ground Clearance: 155 mm (6.1 in)
Dry Weight: 172 kg (378 lbs)
Engine: Air-cooled 398 cc inline-2, DOHC, 4 valves. 36 hp (26.5 kW) @ 8 500 rpm, 29 Nm (2,8 kg-m) @ 6.600 rpm. 6-speed gearbox.
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Click on the image for larger format.
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Suzuki 1980More Suzuki models from 1980
1980 Suzuki year code: T
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A new model with a four valves per cylinder, GSX400E (still called GS400E in North America), replaced the GS400E in 1980.
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Suzuki GS400E1980 Suzuki GS 400 E
Overall Length: 2 090 mm (82.3 in)
Overall Width: 835 mm (32.9 in)
Overall Height: 1 100 mm (43.3 in)
Seat Height: 785 mm (30.9 in)
Wheelbase: 1 385 mm (54.5 in)
Ground Clearance: 155 mm (6.1 in)
Dry Weight: 172 kg (378 lbs)
Engine: Air-cooled 398 cc inline-2, DOHC, 4 valves. 36 hp (26.5 kW) @ 8 500 rpm, 29 Nm (2,8 kg-m) @ 6.600 rpm. 6-speed gearbox.

Click on the image for larger format.
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Suzuki 1991More Suzuki models from 1991
Suzuki model year code: M
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A totally new model. The air cooled, four valve GS400E engine traces its roots back to the first Suzuki four-strokes. The GS400E was a very short-lived model and was soon replaced by the GS500E.
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Suzuki GS400E1991 Suzuki GS 400 E
Overall Length: 2 085 mm (82.1 in)
Overall Width: 750 mm (29.5 in)
Overall Height: 1 050 mm (41.3 in)
Wheelbase: 1 405 mm (55.3 in)
Weight: 169 kg (373 lbs)
Engine: Air-cooled 399 cc inline-2, DOHC, 4 valves. 39 hp @ 9.500 rpm, 3.2 kg-m @ 3 000 rpm

Click on the image for larger format.
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More: GS400 magazine articles

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