From a press release issued by KTM:

990 DUKE (PRE SERIES MODEL)
An uncompromising motorcycle for the streets with minimalist equipment, stronger than the common Naked Bike Twins, ultra light and with a more aggressive, more independent appearance. The 990 DUKE for street use with the 75° fuel injection-V twincylinder LC8 engine. Planned series debut autumn 2004. You will find detailed information starting overleaf.

990 DUKE: PRE SERIES MODEL
KTM definitely moves into the street motorcycle market with this model, but not without remaining true to the brand’s philosophy: with clear-cut identity, groundbreaking technology, and a sports-orientation which is already found in the core segment of off-road motorcycles.

ENGINE

Weight of the LC8 engine?

> The engine weighs 58 kg, approximately 20% lighter than the competition.
>The low weight results from the intelligent engine concept.
> Each component constructed from the viewpoint of durability and low weight.

Engine concept

> Two cylinder, 999 cc displacement.
> Short stroke V-engine with 75° cylinder arrangement
> Electronic fuel injection.
> The LC8 engine is vertically split at different levels for a spacesaving arrangement of the crankshaft and the two shafts of the six gear transmission.
> A space-saving “Multifunction Shaft” rotates in the V between the two cylinders, this supports two counter weights, drives the water pump and the centrifuge of the engine case vent, and serves as an idler for the starter and the two timing chains.
> The gear chains drive in the symmetrical (turned at 180° degrees) cylinder heads, each with 2 overhead camshafts.
> A nearly linear torque curve for a predictable performance pattern.
> Dry sump lubrication with a 3-liter oil tank under the water radiator.
> Series performance 122 hp at 9000 rpm, 99 Nm at 7000 rpm.
> 6-gear transmission gradation and cylinder heads distinguish themselves from the Adventure version.

CHASSIS

Frame concept

> Extremely robust, self-supporting, chromium molybdenum tube frame (round tubes).
> Total weight under 9 kg.

Weight / Tank volume?
> Dry weight 179 kg, at least 15% lighter than what is typical for the class.
> Ready incl. fuel 195 kg.
> The weight distribution is 51% in the front and 49% in the rear.
> The low mounting of the engine (no oil pan) and the positioning of the battery lead to an extremely low centre of gravity and optimal handling.
> The tank volume of the 990 DUKE is around 15 litres.

Shock elements / Seat height
> White Power shock absorber linked directly to the swing arm.
> the shock absorber is both in pressure (high, low speed) and in rebound and spring preload fully adjustable and holds 160 mm suspension travel.
> The fork is a 48 mm White Power USD fork “Multi Adjuster” with 135 mm suspension travel.
> The seat height of the 990 DUKE is just barely over 850 mm.

Cockpit / Equipment
> Centrally arranged, analogue tachometer and multifunctional cockpit display: daily kilometre (mileage) counter, tank stopdistance display, total kilometres (mileage), speed, time, low fuel warning light, cooling temperature, control lights.

Lighting
> Characteristic, extremely lightweight front headlight (only 800 grams) with very high luminance factor.
Brakes
> BREMBO radial hand brake cylinder with 320 mm double disc and 4-piston Brembo brake calliper (with 4 brake pads) in the front.
> 240 mm rear wheel disc brake with single-piston Brembo brake calliper.

Tyre equipment
> Wheel dimensions of 3.5″ in the front and 5.5″ in the rear for guaranteed optimal handling.
> Tyres come into use standard with the dimensions 120/70-17″ resp. 180/55-17″.

All declarations apply to the 990 DUKE pre series model, September 2003 stand, and are subject to technical changes up to the series debut.

990 DUKE: TECHNICAL SPECIFICATION (STATUS SEPTEMBER 2003)

ENGINE…2-Cylinder, 4-Stroke, V 75°
Displacement…999,8 cc
Bore x Stroke…101 x 62,4 mm
Performance…122 HP / 9000 rpm
Max. torque…99 Nm / 7000 rpm
Compression ratio…11,8 : 1
Starter…E-starter
Transmission…6 gears, dog clutch engagement
Fuel…95 ROZ
Mixture conditioning… Electronic fuel injection
Control…DOHC
Valve…spur-gear driven tooth-type chain
Lubrication…Pressure circulation lubrication
Engine oil…Motorex Power Synt 4T, SAE 10W-50
Primary drive…67 : 35
Cooling…Liquid cooling
Clutch…Wet multi-plate clutch, hydraulically operated
Ignition…Denso battery ignition
Spark plug…NGK DCPR 8 E

CHASSIS
Frame…Chromium molybdenum tubular space frame, powder-coated
Subframe…Aluminum
Handlebar…Aluminum conified
Suspension front…WP-USD 48 Multi Adjuster
Suspension rear…WP- Multi Adjuster
Suspension travel front/rear…135 / 160 mm
Brake front…Double disc Ø 320 mm
Brake rear…Disc Ø 240 mm
Rim front/rear…3,5 x 17 ” / 5,5 x 17″
Tire front/rear…120/70 – 17″ / 180/55 – 17″
Transmission ratio…17:38
Battery…12 Ah
Steering head angle…66,5°
Wheelcaster…103 mm
Wheelbase…1438 mm
Ground clearance (unloaded)…165 mm
Seat height (unloaded)…855 mm
Tank capacity…approx. 15 l
Dry weight…approx. 179 kg
Weight (ready to race)…approx. 195 kg


660 SMS „FACTORY REPLICA”

This year the SMS will be offered in two different displacement models: 660 and also for the first time a 450cc. These motorcycles were built for racing and are not street-legal.

The 660 SMS is powered traditionally by the strong LC4 motor, with it is torque and sound performance. It is the ideal motorbike for the open class which it dominates mostly with private riders on a national level.

The 450 SMS, which is equipped with the well known racing motor from the enduro- and motorcross field, is adored for its agility and its light weight. It was therefore made to be THE bike for the small class, especially for young talents it allows the chance to show what they can do. It will be buildt on the base of a 450 Racing SX-basis with reinforced frame etc.

Features 660SMS
> Adjustable geometry of the chassis.
> Small plastic tank with single-piece carbon-spoiler-cowl for freedom of movement and first class handling. The reinforced seat base is made of carbon with an improved fit to increase stiffness and service life.
> Radiator air deflector guarantees an optimum of air supply.
> Carbon rear end with integrated air box is made of carbon to save additional weight, to increase the volume of the air box and to ease
the assembly of the air filter.
> Carbon front number plate for optimal aerodynamics and sleekly optic.
> The carbon used in all carbon parts is Boeing grade prepreg hardened at 180 degrees. The quality of the carbon fibre is up to aero space standard.
> 48mm WM SXS fork and SXS suspension strut with special layer and stiffer fork springs as well as improved tuning of the damping cater for a first class response. The setting was taken over directly from the factory team.
> Milled aluminum triple clamp.
> Racing Brembo brake system with milled 4-piston fixed brake caliper and 16mm radial pump.
> Dunlop slicks.
> Front brakes with cooling air scoop for optimal braking performance.
> Supermoto footrests for the enhancement of the inclined position.
> Akrapovic exhaust system with titanium silencer.

News 660SMS
> Highflow cylinder head.
> New positioning of the rear suspension reservoir for weight reduction, easier mounting and better access to the carburettor as well as a bigger range of excentric setting.
> Stainless steel seat mounting shackle for higher load carrying capacity and longevity.
> Adjusted exhaust mounting for enhanced torsional stiffness.
> Carbon rear end mounting with high strength aluminum alloy eye bolts.