Built around KTM's enduro - offroad motorcycle platform, the 2003 KTM 660 Supermoto Factory Replica pairs a 654 cc (39.9 cu in) liquid-cooled single cylinder, four-stroke architecture with road-focused gearing. In factory specification, peak output is rated at 72 HP (52.6 kW), transferring power to the rear wheel through a 5-speed gearbox and chain final drive. With a specific output of 110.1 HP per liter, the engine character is reflecting a performance-oriented street tune that balances strong mid-range pull with an energetic top-end rush.
On the scales, the 660 Supermoto Factory Replica measures 114 kg (251 lbs) dry, translating to a power-to-weight ratio of 0.63 HP/kg (1.58 kg per horsepower). Rider ergonomics and chassis geometry center around a 915 mm (36 in) seat height — reflecting a long-travel chassis stance that favors ground clearance and off-pavement control, combined with a 1,510 mm (59.4 in) wheelbase engineered for balanced agility and highway composure. The 5.5-liter (1.5 US gal) fuel tank supports practical everyday commuting and weekend road stints.
Specific Output
110.1 HP/L
Power-to-Weight
0.63 HP/kg (1.58 kg/HP)
Standover Height
915 mm (36 in)
Engine
Displacement654.0 ccm (39.91 cubic inches)
Engine TypeSingle cylinder, four-stroke
Engine DetailsSingle cylinder, four-stroke
Power72.0 HP (52.6 kW))
Compression12.5:1
Bore x Stroke102.0 x 80.0 mm (4.0 x 3.1 inches)
Valves/Cylinder4
Fuel SystemCarburettor
CoolingLiquid
Transmission
Gearbox5-speed
Final DriveChain (final drive)
Chassis
Front SuspensionWP-USD 48 Multi Adjuster
Front Travel280 mm (11.0 inches)
Rear SuspensionWP - Monoshock Super Moto Spezial
Rear Travel290 mm (11.4 inches)
Wheelbase1510 mm (59.4 inches)
Ground Clearance290 mm (11.4 inches)
Wheels & Brakes
Front Tyre120/60-17
Rear Tyre165/55-17
Front BrakesSingle disc
Front Brake Ø320 mm (12.6 inches)
Rear BrakesSingle disc
Rear Brake Ø220 mm (8.7 inches)
Dimensions & Weight
Dry Weight114.0 kg (251.3 pounds)
Power/Weight0.6316 HP/kg
Seat Height915 mm (36.0 inches) If adjustable, lowest 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.
Seat Height
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Weight
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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.
