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2004 KTM 990 Duke

KTM 990 Duke

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.

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.

  • 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.
  • Extremely robust, self-supporting, chromium molybdenum tube frame (round tubes).
  • Total weight under 9 kg.
  • 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.
  • 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.
  • 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.
  • Characteristic, extremely lightweight front headlight (only 800 grams) with very high luminance factor.
  • 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.
  • 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.
  • 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
  • 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 320 mm
  • Brake, rear - Disc 240 mm
  • Rim, front/rear - 3,5 x 17 " / 5,5 x 17"
  • Tyre, 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