Suzuki
GS400 1976—1979
Suzuki GS400E 1978—1984
Suzuki GS400L 1979—1986
Suzuki GS400T 1981—1983
Suzuki GS400X 1977—1978
Suzuki GS400E 1991
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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soon hopefully out-of-date.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
model year code: A
Suzuki
model year code: B
Suzuki
model year code: C
A model with spoke wheels, GS400E, was released in 1978.
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.
GS400XB initial frame number: GS400X-13045
GS400XB initial engine number: GS400X-13354
Color: Red
|
|
 GS
400 1978
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 type: Air-cooled 398 cc inline-4, DOHC, 8 valves. 36
hp (26,86 kW)/ 8.500 rpm, 33 Nm (3,2 kg-m)/ 7.000 rpm.
Click on the image for larger format.
|
Suzuki
model year code: N
|
 GS
400 E 1978
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 type: 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.
|
1980
Suzuki year code: T
A new model with a four valves per cylinder, GSX400E (still called
GS400E in North America), replaced the GS400E in 1980.
|
 GS
400 E II 1979
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 type: 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. |
Suzuki
model year code: M
|
1977 GS400 (GK79A) specifications (Finland)
|
|
Engine Type: |
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)/
7.000 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 |
More: GS400
magazine articles
More: GS400
brochures and adverts
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GS400E brochures
and adverts
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GSX models
More: All
Suzuki models
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