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MotoLibrary Score
48/100Balanced
Power/Weight
0.35 hp/kg
Torque
60 Nm
Engine
625 ccm
Technical Overview
2005 KTM 640 Duke II Red Technical Analysis & Specification Breakdown
Positioned in KTM's super motard motorcycle lineup, the 2005 KTM 640 Duke II Red 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 6,750 rpm while maximum torque reaches 60 Nm (44.3 lb-ft) at 5,000 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 1,750 rpm working window between peak torque (5,000 rpm) and peak power (6,750 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 Red measures 152 kg (335 lbs) dry, translating to a power-to-weight ratio of 0.35 HP/kg (2.84 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 11.2-liter (3 US gal) fuel tank supports practical everyday commuting and weekend road stints.
Specific Output
85.8 HP/L
Power-to-Weight
0.35 HP/kg (2.84 kg/HP)
Power Band Window
5,000–6,750 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)) @ 6750 RPM
Torque60.0 Nm (6.1 kgf-m or 44.3 ft.lbs) @ 5000 RPM
Compression11.7:1
Bore x Stroke101.0 x 78.0 mm (4.0 x 3.1 inches)
Valves/Cylinder4
Fuel SystemCarburettor. Mikuni BST 40
Fuel ControlOverhead Cams (OHC)
IgnitionKokusan DC-CDI
LubricationPressure lubrication with 2 Eaton pumps
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.
