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Suzuki GSX 1100SX Katana Prototype

 

Make Model

Suzuki GSX 1100SX Katana Prototype

Year

1980

Engine

Air cooled, four stroke, transverse four cylinder, DOHC, 4 valves per cylinder.

Capacity

1074
Bore x Stroke 72 x 66 mm
Compression Ratio 9:5:1

Induction

4x 34mm Mikuni CV

Ignition  /  Starting

Magnetically triggered  /  electric

Max Power

101 hp @ 8500 rpm

Max Torque

9.34 kg-m @ 6500 rpm

Transmission  /  Drive

5 Speed  /  chain

Front Suspension

Telescopic, oil damped, spring 4-way adjustable with anti-dive

Rear Suspension

Dual shock oil damped, damper 4-way spring 5-way adjustable

Front Brakes

2x 275mm discs 2 piston calipers

Rear Brakes

Single 275mm disc 1 piston caliper

Front Tyre

3.50 V19

Rear Tyre

4.50 V17

Dry-Weight

243 kg

Fuel Capacity 

22 Litres

In 1980 at the Cologne motorcycle show, the world saw its first Katana. With its advanced and aggressive body styling, which broke from the more traditional motorcycle styling leading up to that time, it was sure to be a show stealer, and it was.
The GSX1100S Katana was released the following summer, in 1981. Quite a lot of people thought that the Cologne 'concept' bike would be for show, with not many features retained on the production bike. They were to be proved wrong, for in 1981, when the GSX1100S Katana was released it retained the same styling with just a few improvements and changes here and there.
The Katana was designed by Hans A. Muth of target DESIGN in West Germany. As well as designing the Kat to be a real eye catcher, they also spent time investigating the best positions for rider comfort. So the large capacity tank and small fairing are blended together for the best airflow around the rider and the bike, not just for stunning appearance.
To gain entry for the bike into Production racing, Suzuki released a 1000cc version. These are very rear (and expensive) in the UK and can mainly be distinguished from the 1100 by the use of 32mm slide carbs  as opposed to the 1100's 34mm CV items.

Production Katana

The Katana 1100 that Suzuki unleashed on an unsuspecting motorcycle world in 1982 was a machine like nothing seen before from Japan. It was bold, stylish, imaginative, breathtaking: very different to the succession of fast but visually dull models that had preceded it. And underneath all the fancy bodywork, the Katana was an outstanding superbike too.

Katana was the Japanese word for a Samurai warrior's ceremonial sword, and it fitted Suzuki's sharp new silver blade perfectly. With its pointed nose, tiny flyscreen. low clip-on handlebars and swooping tank-seat section, the Katana was a unique machine with an infinitely more aggressive image than the GSXI100 roadster to which it was closely related.

 

This landmark in the history of Japanese superbike development had partly European parentage. The Katana had been shaped by the German group Target Design (which had also been responsible for BMW's striking R90S almost a decade earlier). Although some riders criticized the Suzuki for being more notable for style than practicality, most welcomed the alternative to the

formatted 'Universal Japanese Motorcycle' with its four-cylinder engine and unfaired, upright riding position that provided no wind protection.

 

Suzuki had the ideal basis for the Katana in the 1075CC air-cooled engine from the GSX1 100. with its 16 valves, phenomenally broad spread of power, and reputation for reliability. To give the new bike extra teeth, the motor was tuned with a modified airbox, reworked carburettors, new exhaust camshaft and lightened alternator. It produced a maximum of 111 bhp at 850()rpm. a useful 11 bhp up on the standard unit.

Chassis layout remained conventional, and the twin-cradle steel frame was unchanged, but many parts were new. Suspension was stiffened at both ends, new triple clamps gave a shallower steering angle for added stability, and the front forks gained a hydraulic anti-dive system claimed to be similar to that of Suzuki's 500cc grand prix racers.

 

Breathtaking acceleration

The Katana looked lightning fast when standing still, and when moving it was much, much faster. The big GSX motor was already a superb  powerplant. with huge reserves of instant mid-range torque. The Katana had breathtaking acceleration - and even more urge at the top end.

 

Top speed was a genuine 140mph (225km/h). And the Katana's stretched-forward riding position, with its welcome bit of wind protection from the small screen, made that performance more usable than that of most rivals.

Handling was very good for such a big. heavy bike. The fairing and screen were solidly mounted, so contributing to the Katana's impressive highspeed stability. The firm suspension gave a level of control (and discomfort) that was almost Italian, marred only by the anti-dive's occasional tendency to make the forks lock up over a series of bumps. The triple-disc brake system worked well, even in the wet. though this could not be said of the standard fitment tyres.

 

Inevitably, the radical Katana did not suit every rider or every occasion. Its suspension was harsh and uncomfortable in town, its seat was hard, and its steering was quite heavy al slow speed. But this was not a bike to be ridden at slow speed. Its

purposeful nature was an integral part of its appeal. At last, this was a Japanese bike that provided both performance, handling and style, at a sensible price.

 

The Katana was a huge hit. and remained popular for years. Suzuki broadened the Katana range with a 1000cc version with slide carbs for production racing, watered-down middleweight models, and even pocket-sized 250 and 400cc replicas for the Japanese market. Years later they even restarted production of a "special edition' Katana 1100 that was almost identical to the original. Fair reward for a brave and brilliant bike.

Source Fast Bikes by Roland Brown

 

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