The KTM 640 Duke II motorcycle was produced between 1998 and 2000. It features a four-stroke, single cylinder engine with a capacity of 624.6 cc and a compression ratio of 11.5:1. The engine is liquid-cooled and features a Mikuni BST 40 carburetor and Kokusan contactless DC-CDI ignition with an advanced system. The bike can be started with an electric or kick start. With a maximum power output of 40.1 kW / 55 hp at 7000 rpm and a maximum torque of 60 Nm / 6.1 kgf-m / 44.3 lb-ft at 5500 rpm, the KTM 640 Duke II is capable of delivering fast and efficient performance. The multi-disc clutch and 5-speed transmission allows for smooth gear changes. The motorcycle features a central chrome-moly steel frame, front and rear suspensions, a 320 mm disc brake in the front and a 220 mm disc brake in the rear. The KTM 640 Duke II has a ground clearance of 250 mm / 9.9 in, a seat height of 860 mm / 33.9 in, a dry weight of 145 kg / 320lbs and a fuel capacity of 11.3 L / 3.0 US gal / 2.4 Imp gal. The bike is capable of reaching a top speed of 162 km/h / 101 mph and completing the standing 1/4 mile in 12.5 seconds.
Technical specifications:
Make Model: KTM 640 Duke II
| Year | 1998 – 00 |
|---|---|
| Engine | Four stroke, single Cylinder. SOHC, 4 valves, engine balancer |
| Capacity | 624.6 cc / 38.1 cu in |
| Bore x Stroke | 101 x 78 mm |
| Compression Ratio | 11.5:1 |
| Cooling System | Liquid cooled |
| Lubrication | 2 x Eaten oil pumps |
| Induction | Mikuni BST 40 carburetor |
| Ignition | Kokusan contactless DC-CDI ignition with advanced system |
| Starting | Electric & kick |
| Spark Plug | NGK DRBEA |
| Battery | 12V 8Ah, maintenance free |
| Max Power | 40.1 kW / 55 hp @ 7000 rpm |
| Max Torque | 60 Nm / 6.1 kgf-m / 44.3 lb-ft @ 5500 rpm |
| Clutch | Multi-disc in oil bath |
| Transmission | 5 Speed |
| Primary Drive Ratio | 30:81, straight cut gears |
| Gear Ratios | 1st 14:35 / 2nd 15:24 / 3rd 18:21 / 4th 20:19 / 5th 22:18 |
| Final Drive Ratio | 17:38 |
| Final Drive | Chain, O-ring 5/8 x 1/4″ |
| Frame | Central chrome-moly steel frame |
| Front Suspension | WP – 4054 Roma Top adjuster, preload, compression and rebound adjustable |
| Front Wheel Travel | 140 mm / 5.5 in |
| Rear Suspension | Central shock absorber WP IBS with PRO-LEVER linkage to rear- swing-arm with needle bearing |
| Rear Wheel Travel | 170 mm / 6.7 in |
| Front Brakes | Single 320 mm disc, 4 piston caliper |
| Rear Brakes | Single 220 mm disc, 1 piston caliper |
| Front Tyre | 120/70 – ZR17 58H |
| Rear Tyre | 160/60 – ZR17 69H |
| Steering Head Angle | 62.5o |
| Wheelbase | 1460 mm / 57.5 in |
| Ground Clearance | 250 mm / 9.9 in |
| Seat Height | 860 mm / 33.9 in |
| Dry Weight | 145 kg / 320lbs |
| GVWR | 350 kg / 773 lbs |
| Engine Oil Capacity | 2.2 L / 2.3 US qt / 1.9 Imp qt |
| Fuel Capacity | 11.3 L / 3.0 US gal / 2.4 Imp gal |
| Standing 1/4 Mile | 12.5 sec |
| Top Speed | 162 km/h / 101 mph |
