The KTM 690 Duke was a motorcycle developed for KTM's line of midrange LC4 single-cylinder engine supermoto, or naked motorcycles that began with the 1994 displacement Duke 620 or Duke I, followed by the 1998 Duke 640 or Duke II, followed by the Duke III, and finally the Duke IV made since 2012. Both the Duke III and Duke IV are called the 690 Duke
Specifications by model/year Year 1994–1997 1998–2007 2008–2011 2012 2013 2016–2018 Model 620 Duke I 640 Duke II 690 Duke III 690 Duke IV 690 Duke R Displacement Engine Liquid cooled, 4-valve SOHC 4 stroke single Starting Kick Kick & Electric Electric Electric & Auto-decompress Bore × stroke Compression10.4:1 11.5:1 11.7:1 12.6:1 Fuel system Dell'Orto carburetor (49-state)38 mm Edelbrock Qwik Silver II (CARB) Mikuni BST 40mm carburetor Carburetor (2008) Keihin EFI (2009–2011) Keihin EFI 3 modes EFI Keihin 50 mm throttle body Ignition Kokusan contactless DC-CDI Kokusan DC-CDI Digital, 3 Modes, Single Spark plug. Digital, 3 modes, twin spark Digital, 3 modes, twin spark Transmission 5-speed, chain drive 6 speed, chain drive, Slipper Clutch 6-speed, chain drive, slipper clutch Frame Chromoly Steel trellis, aluminum swingarm Front brake Brembo 4-piston caliper, 320 mm disc Single Brembo four-piston radial caliper, 320 mm disc Single Brembo four-piston radial caliper, 320 mm disc Single four-piston radial caliper, 320 mm disc, ABSSingle four-piston Brembo M50 radial caliper, 320 mm disc, ABS Single Brembo M50 four-piston radial-mounted caliper, 320 mm rotor, Bosch two-channel ABS Rear brake Brembo 1-piston caliper, 220 mm disc Brembo caliper, 240 mm disc Single four-piston caliper, 240 mm disc 240 mm floating single-piston caliper Front suspension WP 4054, Top Adjuster, telescopic fork WP 43 inverted fork 48 mm WP inverted fork, adjustable preload, compression, rebound, travel WP inverted fork travel WP inverted fork, adjustable preload, compression, rebound, travel WP 4 3mm inverted fork Rear suspension WP monoshock 4681 BAVP, Single Adjuster WP monoshock WP monoshock, adjustable preload, compression, rebound, Pro-Lever, travel WP shock, adjustable preload only, travel WP shock, adjustable preload, compression, rebound, travel WP linkage-actuated gas-charged shock adjustable spring preload Wheels Akront wire-spoke, 17 × 3.5" front17 × 4.5" rear 17 × 3.5" front17 × 4.5" rear 17-inch 5 spoke Marchesini forged Alum wheels 17-inch, 10-spoke forged-aluminum Tires Pirelli MT60 radial 120/70-17 front160/70-17 rear Dunlop Sportmax GPR120/70-ZR17 front160/60-ZR17 rear Michelin Pilot Power Metzeler MR77 120/70-17 front 160/60-17 rear Rake, trail 26.5°, 26.5°, 26.5° Wheelbase Seat height Dry weight (claimed) Wet weight (claimed) Fuel capacity Performance Power @ 7,000 rpm @ 7,600 rpm (claimed) (claimed) (claimed) Torque @ 5,500 rpm @ 5,425 rpm (claimed) (claimed) Fuel consumption Top speed seconds 4.8 3.6–3.92 13.1 @ 12.28 @ 12.35 @ Braking
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