KTM 640 Duke II (1998-00)

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.

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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