# KTM 690 Duke

The KTM 690 Duke was a motorcycle developed for KTM's line of midrange single-cylinder engine supermoto, or naked motorcycles that began with the 1994 609 cc (37.2 cu in) displacement Duke 620 or Duke I, followed by the 1998 625 cc (38.1 cu in) Duke 640 or Duke II, followed by the 654 cc (39.9 cu in) Duke III, and finally the 690 cc (42 cu in) Duke IV made since 2012. Both the Duke III and Duke IV are called the 690 Duke
The Duke was KTM's first street bike, and first supermoto, having previously made only off-road and racing motorcycles. In 1998 KTM introduced the 640 Supermoto, so the Duke line became a more street oriented standard or streetfighter, while retaining some off-road characteristics like a relatively long suspension travel. Initially the Duke was KTM's entry level street bike, but later KTM partnered with Bajaj Auto to produce the 125 Duke, 200 Duke, and 390 Duke in India, placing the 600 cc class Dukes in the middle of their range. In 2005, KTM introduced the Super Duke to expand the range above the middle Duke, initially 999 cc (61.0 cu in) and later growing to 1,301 cc (79.4 cu in).

## Specifications

| Year | 1994–1997 | 1998–2007 | 2008–2011 | 2012 | 2013 | 2016–2018 |
| Model | 620 I | 640 II | 690 III | 690 IV | 690 R | |
| Displacement | 609 cc (37.2 cu in) | 625 cc (38.1 cu in) | 653.7 cc (39.89 cu in) | 690 cc (42 cu in) | 690 cc (42 cu in) | 693 cc (42.3 cu in) |
| Engine | 4-valve SOHC 4 stroke single | 4-valve SOHC 4 stroke single | 4-valve SOHC 4 stroke single | 4-valve SOHC 4 stroke single | 4-valve SOHC 4 stroke single | |
| Starting | Kick, automatic compression release | | | Electric starter automatic compression release | Electric starter automatic compression release | |
| Bore × stroke | 101 mm × 76 mm (4.0 in × 3.0 in) | 101 mm × 78 mm (4.0 in × 3.1 in) | 102.0 mm × 80.0 mm (4.02 in × 3.15 in) | 102.0 mm × 84.5 mm (4.02 in × 3.33 in) | 102.0 mm × 84.5 mm (4.02 in × 3.33 in) | 105.0 mm × 80.0 mm (4.13 in × 3.15 in) |
| Compression | | 11.7:1 | 11.7:1 | | | |
| Fuel system | Dell'Orto carburetor (49-state) 38 mm Edelbrock Qwik Silver II (California) | | Keihin EFI | Keihin EFI 3 modes | Keihin EFI 3 modes | EFI Keihin 50 mm throttle body |
| Ignition | | CDI | Digital, 3 Modes, Single Spark plug. | Digital, 3 modes, twin spark | 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 | 6-speed, chain drive, slipper clutch | |
| Frame | Steel trellis, aluminum swingarm | Chromoly steel trellis | Steel trellis | Chromoly steel trellis | Chromoly steel trellis | |
| 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, ABS | Single 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 | Single four-piston caliper, 240 mm disc | 240 mm floating single-piston caliper |
| Front suspension | WP 40 mm telescopic fork | WP 43 inverted fork | 48 mm WP inverted fork, adjustable preload, compression, rebound, 140 mm (5.6 in) travel | WP inverted fork 135 mm (5.3 in) travel | WP inverted fork, adjustable preload, compression, rebound, 150 mm (5.9 in) travel | WP 4 3mm inverted fork |
| Rear suspension | WP monoshock | WP monoshock | WP monoshock, adjustable preload, compression, rebound, Pro-Lever, 140 mm (5.6 in) travel | WP shock, adjustable preload only, 135 mm (5.3 in) travel | WP shock, adjustable preload, compression, rebound, 150 mm (5.9 in) travel | WP linkage-actuated gas-charged shock adjustable spring preload |
| Wheels | Akront wire-spoke, 17 × 3.5" front 17 × 4.5" rear | 17 × 3.5" front 17 × 4.5" rear | 17-inch 5 spoke Marchesini forged Alum wheels | | | 17-inch, 10-spoke forged-aluminum |
| Tires | Pirelli MT60 radial | 120/70-17 front 160/70-17 rear | Dunlop Sportmax GPR 120/70-ZR17 front 160/60-ZR17 rear | | | Metzeler MR77 120/70-17 front 160/60-17 rear |
| Rake, trail | | 26.5°, 109 mm (4.3 in) | 26.5°, 115 mm (4.53 in) | 26.5° | 26.5° | |
| Wheelbase | | | 1,470 mm (57.9 in) | | | |
| Length | | | | | | |
| Width | | | | | | |
| Height | | | | | | |
| Seat height | 890 mm (35 in) | 900 mm (35 in) | 876 or 895 mm (34.5 or 35.25 in) | 835 mm (32.9 in) | 865 mm (34.1 in) | |
| Dry weight | | | 151 kg (334 lb) | 149.5 kg (330 lb) (claimed) | 149.5 kg (330 lb) (claimed) | |
| Wet weight | 150 kg (340 lb) | 161 kg (355 lb) | 160.6 kg (354.0 lb) | 160 kg (352 lb) (claimed) | | |
| Fuel capacity | 11 L; 2.5 imp gal (3 US gal) | 11.5 L (2.5 imp gal; 3.0 US gal) | 13.5 L; 2.97 imp gal (3.57 US gal) | | | |
| Performance |||||||
| Power | | 40 kW (54 bhp) @ 7,000 rpm | 44.5–45.9 kW (59.7–61.6 hp) @ 7,600 rpm | 50 kW (67 hp) (claimed) | 51.5 kW (69.1 hp) (claimed) | 54 kW (73 hp) (claimed) |
| Torque | | 60 N⋅m (44 lb⋅ft) @ 5,500 rpm | 62.31–65.08 N⋅m (45.96–48.0 lb⋅ft) @ 5,425 rpm | | 70.1 N⋅m (51.7 lb⋅ft)(claimed) | 75 N⋅m (55 lb⋅ft)(claimed) |
| Fuel consumption | | 15.4 km/L (44 mpg$_{‑imp}$; 36 mpg$_{‑US}$) | 49.7–51 mpg$_{‑US}$ (4.73–4.61 L/100 km; 59.7–61.2 mpg$_{‑imp}$) | | | |
| Top speed | | 120 mph (190 km/h) | 183.5–188.1 km/h (114–116.9 mph) | | | |
| 0 to 60 mph (0 to 97 km/h) seconds | | 4.8 | 3.6–3.92 | | | |
| 0 to 1⁄4 mi (0.00 to 0.40 km) | | | 12.28 @ 168.42 km/h (104.65 mph) 12.35 @ 164.09 km/h (101.96 mph) | | | |
| Braking 60 to 0 mph (97 to 0 km/h) | | | 39.3 m (128.9 ft) | | | |