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Suzuki GSX400 Impulse
| I have put some Suzuki GSX 400 and GSX400 S Impulse
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Suzuki model year code: R
Suzuki have had loads of trouble making an impression
in the 400 market. The GSF400 Bandit should have made some kind
of mark but the early models proved to be unrealiable. Carburetor
problems plagued its far from subtle early incarnations, though
it arguably had more style and sophistication than the Impulse.
GSX400 Impulse (internal code GK79A) was released in 1994 for
Japanese home market with a chassis straight out of the seventies,
although it’s far more competent (125 mph, 55 mpg) than the
old bruisers. The bike has the same engine internals as the GSF400
Bandit but has different engine cases and a much larger frame.
The motor’s still highly strung and therefore somewhat misplaced
in retro guise. Two different versions were made, the GSX400S (GSX400 Type S) had a cockpit fairing and blue/white paint scheme.
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1995 Suzuki year code: S
Suzuki model year code: T
Although the models look identical at a glance,
there are some differences between the different model years of
Suzuki GSX400 Impulse. The wheels , the side covers and the oil filter
covers and the tailpiece, to mention some details, are different.
The wheelbase and the performance are the same but the bike is
now a bit longer and little heavier than the first model.
New KYB suspension.
Some of the 1996 models and later had “KYB” stickers on the front and back suspensions. Handles on both sides of the saddle.
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Suzuki model year code: U
GSX400 Impulse became soon somewhat of a cult bike
in Japan, a fact that held the used bike prices high. The GSX400
Impulse owner haven't had the same problems as many GSX400 owner's
in the early eighties with overheated engines, burned up alternators
and corroding exhaust etc. The Impulse is as reliable as any other
modern Japanese motorcycle with good performance.
There's nothing wrong with the bike, the engine runs smooth and
quiet, the top end is particularly rattle free. The brakes (290
mm double disks at the front and a 250 mm single disk at the rear)
are excellent and the engine is powerful but the engine never
manages to find a sweet spot with enough of torque.
Sum summarum, the bike could be described as adequate. The suspension
and comfort are adequate, the geometry's relatively fast turning
and the stability at higher speeds is not as good as old bruisers
like GS550. If the Impulse never inspires neither does it frighten.
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1999 Suzuki year code: X
The 1999-year's Suzuki 400 Impulse got new front brakes and side panel logos. The old panels said “GSX 400” while the new ones says “Impulse”.
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2001 Suzuki year code: K1
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2001 GSX400 Impulse (GK79A) specifications (Japan) |
| Engine: |
Liquid-cooled DOHC inline-four 4-stroke |
| Cylinder Volume: |
399 cc |
| Bore x Stroke: |
52.0 x 47.0 mm |
| Compression Ratio: |
11.8:1 |
| Power output: |
53 hp (37 kW)/ 11.000 rpm |
| Torque: |
37 Nm (3.8 kg-m)/ 9.500 rpm |
| Fuel Tank Capacity: |
16 liter |
| Overall Length: |
2 080 mm (81.9 in.) |
| Overall Width: |
740 mm (29.1 in.) |
| Overall Height: |
1 110 mm (43.7 in.) |
| Wheelbase: |
1 435 mm (56.5 in.) |
| Seat Height: |
760 mm (29.9 in.) |
| Ground Clearance: |
120 mm (4.7 in.) |
| Dry Weight: |
175 kg (385 lbs) |
| Transmission: |
6-speed Constant Mesh |
| 1st Gear Ratio: |
3.363 |
| 2nd Gear Ratio: |
2.307 |
| 3rd Gear Ratio: |
1.750 |
| 4th Gear Ratio: |
1.437 |
| 5th Gear Ratio: |
1.250 |
| 6th Gear Ratio: |
1.136 |
| Primary Drive Ratio: |
1.750 |
| Final Drive Ratio: |
3.428 |
| Starting System: |
Electric Starter |
| Ignition System: |
Full Transistor |
| Oil Capacity: |
3.2 liter |
| Caster: |
25° 40' |
| Trail: |
98 mm (3.86 in.) |
| Front Tire: |
110/70-17 54H |
| Rear Tire: |
140/70-17 66H |
| Front Brake: |
Double Hydraulic Disk |
| Rear Brake: |
Single Hydraulic Disk |
| Fuel Consumption: |
36,5 km/liter (60 km/h) |
| Carburetor Type: |
BST29 |
| Turning Radius: |
2,7 meter |
| Steering Angle (left to right): |
36° |
| Suggested Retail Price (Japan): |
599,000 Yen |
2002 Suzuki year code: K2
2003 Suzuki year code: K3
2004 Suzuki year code: K4
2005 Suzuki year code: K5
In October 2004 Suzuki presented a new, gently updated version of the popular Impulse model. All Black engine, new exhaust system, some other minor upgrades. The old “Suzuki” badge on the fuel tank was replaced with Suzuki's “S” logo.
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2006 Suzuki year code: K6
2007 Suzuki year code: K7
2008 Suzuki year code: K8
The “KYB” stickers are now gone. A Special Edition model with the 1982 GSX400FS Impulse Red/White/Black graphics was introduced in December 21th, 2007.
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 2008 Suzuki GSX 400 Impulse
Overall Length: 2 080 mm (81.9 in)
Overall Width: 745 mm (29.3 in)
Overall Height: 1 105 mm (43.5 in)
Seat Height: 760 mm (29.9 in)
Wheelbase: 1 435 mm (56.5 in)
Dry Weight: 177 kg (390 lbs)
Engine: Liquid-cooled 399 cc inline-4, DOHC, 16 valves. 53 hp (39 kW) @ 11 000 rpm, 37 Nm (3.8 kg-m) @ 9 500 rpm
Click on the image for larger format.
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|
 2008 Suzuki GSX 400 Impulse
Overall Length: 2 080 mm (81.9 in)
Overall Width: 745 mm (29.3 in)
Overall Height: 1 105 mm (43.5 in)
Seat Height: 760 mm (29.9 in)
Wheelbase: 1 435 mm (56.5 in)
Dry Weight: 177 kg (390 lbs)
Engine: Liquid-cooled 399 cc inline-4, DOHC, 16 valves. 53 hp (39 kW) @ 11 000 rpm, 37 Nm (3.8 kg-m) @ 9 500 rpm
Click on the image for larger format.
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|  2008 Suzuki GSX 400 Impulse SE
Overall Length: 2 080 mm (81.9 in)
Overall Width: 745 mm (29.3 in)
Overall Height: 1 105 mm (43.5 in)
Seat Height: 760 mm (29.9 in)
Wheelbase: 1 435 mm (56.5 in)
Dry Weight: 177 kg (390 lbs)
Engine: Liquid-cooled 399 cc inline-4, DOHC, 16 valves. 53 hp (39 kW) @ 11 000 rpm, 37 Nm (3.8 kg-m) @ 9 500 rpm
Click on the image for larger format.
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|  2008 Suzuki GSX 400 Impulse SE
Overall Length: 2 080 mm (81.9 in)
Overall Width: 745 mm (29.3 in)
Overall Height: 1 105 mm (43.5 in)
Seat Height: 760 mm (29.9 in)
Wheelbase: 1 435 mm (56.5 in)
Dry Weight: 177 kg (390 lbs)
Engine: Liquid-cooled 399 cc inline-4, DOHC, 16 valves. 53 hp (39 kW) @ 11 000 rpm, 37 Nm (3.8 kg-m) @ 9 500 rpm
Click on the image for larger format.
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More: Suzuki GSX models
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