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Suzuki GSX 400E-S

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Make Model

Suzuki GSX 400E - S

Year

1984 - 86

Engine

Four stroke, parallel twin, DOHC, 4 valves per cylinder.

Capacity

398 cc / 24.3 cu in
Bore x Stroke 67 x 56.6 mm
Cooling System Air cooled
Compression Ratio 10.5:1
Lubrication Wet sump
Oil Capacity 3.0 Litres / 3.2 US qt / 2.6 Imp qt

Induction

2 x Mikuni BS34SS carburetors

Ignition 

Transistorized 
Starting Electric

Max Power

32.8 kW / 44 hp @ 9500 rpm

Max Torque

36.3 Nm / 3.7 kgf-m 26.8 lb-ft @ 8000 rpm
Clutch Wet multiple plates, coil spring

Transmission 

6 speed constant mesh
Final Drive Chain
Gear Ratio 1st 2.461 / 2nd 1.777 / 3rd 1.380 / 4th 1.125 / 5th 0.961 / 6th 0.851:1
 Primary Drive Ratio 2.714
Secondary Drive Ratio 2.933
Frame Double cradle

Front Suspension

Air assisted telescopic forks

Rear Suspension

Dual shocks, preload adjustable

Front Brakes

Single disc

Rear Brakes

Drum

Front Tyre

3.00S-18 4PR

Rear Tyre

3.50S-18 4PR
Caster 27.50
Trail 102 mm / 4.02 in
Dimensions Length 2105 mm / 82,9 in
Width    755 mm / 29,7 in
Height  1070 mm / 42,1 in
Wheelbase 1415 mm / 55,7 in
Ground Clearance 145 mm / 5.7 in
Seat Height 755 mm / 29.7 in

Dry Weight

176 kg / 388 lbs

Fuel Capacity 

16 Litres / 4.2 US gal / 3.5 Imp gal

Consumption Average

5.2 L/100 km / 19.1 km/l / 45 US mpg / 64 Imp mpg

Standing ¼ Mile  

15.2 sec

Top Speed

158 km/h / 98 mph

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.

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.

Source suzukicycles.org

Review

Build a better motorcycle and the world doesn't necessarily beat a path to your door. For several years now Suzuki has built one of the sweetest small-displacement twins available, and although it has captured a market share, it'snever matched the sales success of overrated custom bikes in the same general displacement category.

That's too bad. because the bike continues to impress us in its latest incarnation, the GS400S, as a sound, practical and fun motorcycle, especially for learners, riders of small stature and city dwellers.

Suzuki recognized the need to draw more attention to the GS400's merits, and in '84 has larted it up with flashier gold wheels, new paint and a nose fairing on the CS400S model. The mechanical package remains largely unchanged, but there are a few refinements.

Suzuki has left the engine untouched for the '84 model, except to paint it black with matching exhaust pipes, and the DOHC. four-valve twin remains a winner. A gear-driven counterbalance smooths the imbalance of a 100-degree parallel twin to the extent that the CS400 is smoother than most of Suzuki's fours. Carburetion is crisp and the engine pulls well from low revs to redline without any hesitation or flat spots. Power comes on most strongIy above6.000 rpm but you don't need to row through the gearbox for ordinary street use. nor is it necessary to keep it pinned at red-line for a sporting ride. Theexhaust noise seems unexciting, and overwhelmed at low speed by the engine's mechanical noise, but the GS400S is a quiet motorcycle.

During our last test of the '82 GS400 we recorded a quarter mile time of 14.16 seconds at 146 km/h (91 mph), which puts the small Suzuki into a sporting realm. But its mild manners and low-speed pulling power also make it well suited to learners and commuters,

In udditlon. the GS400S returns good fuel economy: 4.4 L/100 km (63 mpg during our test despite some hard use and break-in mileage. The tank holds 16 L. providing an excellent range of 358 km and the fuel gauge is accurate enough to be useful until reserve is reached.

Suzuki has moved the choke from beside the carburetors to its proper place on the handlebar, where it is easily adjustable for cold morning starts. The engine warms up fairly slowly, but can be ridden off under choke.

The clutch drags slightly on cold mornings, and the transmission works better when it's warm too. Shifting action Is usually positive and light, but neutral can be occasionally difficult to find. The gearbox would work better if the shift lever weren't so short. Most riders shifted with the top of the foot rather than the toes, and found the effort sometimes painful. You can work around the problem by moving your foot back for each shift.

Since sporting motorcycles have made huge strides in recent years. the GS400S seems less impressive than its paint and styling would suggest. Hut it's still a capable and entertaining bike at low and medium speeds, where steering is precise and effortless. Light weight and a reasonably rigid chassis and firm suspension help, but the GS400S predictably loses its composure at higher speeds where it begins lo wallow and weave.

The rear shocks are the most obvious culprit, being noticeably underdamped. but their performance is adequate for a budget motorcycle. Stability on the highway is fine for a lightweight bike, though it is unavoidably susceptible to crosswinds.

Suzuki has upgraded the front suspension this year with air caps on the fork, and the front end works well in absorbing bumps and maintaining both comfort and control. The recommended pressure setting is 50 kPa(7 psi).

The factory would have been well advised to have hailed its development of the front end at this point, but unfortunately continued and added Suzuki's much-criticized hydraulic anti-dive on the left fork leg. Extra pressure in the fork is already sufficient to control dive, and the anti-dive has the usual effect of creating a mushy feel at the lever for the front disc.

The single disc has enough power to lock the wheel, but only with high effort, and approaching lockup is difficult to sense because of the brake's vague feel. The rear drum, on the other hand, is powerful yet easily controlled.

New this year are the gold-anodized rims in the same pattern as Suzuki's bigger sport bikes, but the width of the rims is still very small. The budget-variety Bridgestone 3.00S18 front and 3.50S18 rear tires are skinny and look out of place on an '84 bike. Meatier rubber would be welcome.

The GS400 is one of the most comfortable small bikes to ride, with a low. comfortable seat and a semi-sporting relationship between the pegs and handlebar that make an almost ideal seating posture.

A good owner's manual comes wilh the GS400S and allows an owner to perform most basic maintenance by following the instructions. The oiled-foam air filter is easily reached once the seat is removed.

The styling and paint of the GS400S are hard to fault. The bike is handsome and the quality of finish excellent. Instrumentation is clear, and a digital gear indicator proves useful at times. Our test model had been hastily set up. and the sidestand indicator light and oil light were malfunclioning. but otherwise the Suzuki was problem-free.

Source CYCLE CANADA 1985