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MotoLibrary Score
48/100Balanced
Power/Weight
0.36 hp/kg
Torque
60 Nm
Engine
625 ccm
Technical Overview
2004 KTM 640 Duke II Yellow - Black Technical Analysis & Specification Breakdown
Built around KTM's super motard motorcycle platform, the 2004 KTM 640 Duke II Yellow - Black utilizes a 625 cc (38.1 cu in) liquid-cooled single cylinder, four-stroke layout. In factory specification, peak output is rated at 53.6 HP (39.2 kW) at 7,000 rpm while maximum torque reaches 60 Nm (44.3 lb-ft) at 5,500 rpm, transferring power to the rear wheel through a 5-speed gearbox and chain final drive. With a specific output of 85.8 HP per liter and a 1,500 rpm working window between peak torque (5,500 rpm) and peak power (7,000 rpm), the engine character is indicating a tractable, stress-free state of tune focused on everyday usability and broad torque delivery.
On the scales, the 640 Duke II Yellow - Black measures 149 kg (328 lbs) dry, translating to a power-to-weight ratio of 0.36 HP/kg (2.78 kg per horsepower). Rider ergonomics and chassis geometry center around a 900 mm (35.4 in) seat height — reflecting a long-travel chassis stance that favors ground clearance and off-pavement control, combined with a 1,460 mm (57.5 in) wheelbase engineered for balanced agility and highway composure. The 12-liter (3.2 US gal) fuel tank supports practical everyday commuting and weekend road stints.
Specific Output
85.8 HP/L
Power-to-Weight
0.36 HP/kg (2.78 kg/HP)
Power Band Window
5,500–7,000 rpm
Standover Height
900 mm (35.4 in)
Engine
Displacement625.0 ccm (38.14 cubic inches)
Engine TypeSingle cylinder, four-stroke
Engine DetailsSingle cylinder, four-stroke
Power53.6 HP (39.2 kW)) @ 7000 RPM
Torque60.0 Nm (6.1 kgf-m or 44.3 ft.lbs) @ 5500 RPM
Compression11.7:1
Bore x Stroke101.0 x 78.0 mm (4.0 x 3.1 inches)
Fuel SystemCarburettor
Fuel ControlOverhead Cams (OHC)
CoolingLiquid
Transmission
Gearbox5-speed
Final DriveChain (final drive)
Chassis
Frame TypeChromium-molybdenum, power-coated
Trail64 mm (2.5 inches)
Front SuspensionWP-USD 43 MA
Rear SuspensionWP - Monoshock
Wheelbase1460 mm (57.5 inches)
Ground Clearance270 mm (10.6 inches)
Wheels & Brakes
Front Tyre120/70-17
Front BrakesSingle disc
Front Brake Ø320 mm (12.6 inches)
Rear BrakesSingle disc
Rear Brake Ø220 mm (8.7 inches)
Dimensions & Weight
Dry Weight149.0 kg (328.5 pounds)
Power/Weight0.3600 HP/kg
Seat Height900 mm (35.4 inches) If adjustable, lowest setting.
Alt. Seat Height675 mm (26.6 inches) If adjustable, highest setting.
Use this page to compare this motorcycle by its real specifications, not only by model name. Focus on the details that affect fit, comfort, handling, range and ownership.
Power
Compare engine output with similar motorcycles if acceleration, highway use or two-up riding matters.
Torque
Torque is useful for judging real-world pull, especially for touring, commuting and loaded riding.
Seat Height
Check the seat height against your inseam and riding posture before choosing a motorcycle.
Weight
Compare weight carefully because it affects low-speed handling, parking and confidence.
Fuel Capacity
Fuel capacity helps estimate touring range and how often you may need to stop.
Brakes
Brake setup is worth comparing if you ride in traffic, mountains or with a passenger.
Suspension
Suspension details can matter for comfort, road feel and long-distance riding.
Transmission
Transmission and final drive affect maintenance, smoothness and everyday usability.
