Engineered by KTM for the minibike, sport motorcycle segment, the 2004 KTM 50 SX Pro Junior LC relies on a 49 cc (3 cu in) liquid-cooled single cylinder, two-stroke powerplant. In factory specification, peak output is rated at 6 HP (4.4 kW), transferring power to the rear wheel through a automatic gearbox and chain final drive. Internal engine geometry specifies a bore and stroke of 39.5 x 40.0 mm (1.6 x 1.6 inches).
On the scales, the 50 SX Pro Junior LC measures 37.6 kg (83 lbs) dry. Rider ergonomics and chassis geometry center around a 650 mm (25.6 in) seat height — giving shorter riders and urban commuters confident flat-foot reach at traffic stops, combined with a 910 mm (35.8 in) wheelbase engineered for quick, flickable steering geometry. The 1.8-liter (0.5 US gal) fuel tank supports practical everyday commuting and weekend road stints.
Within MotoLibrary's KTM archive, this model family spans 3 indexed model years from 2003 to 2005, allowing buyers to track year-over-year changes in emissions tuning, weight and equipment.
Standover Height
650 mm (25.6 in)
Engine
Displacement49.0 ccm (2.99 cubic inches)
Engine TypeSingle cylinder, two-stroke
Engine DetailsSingle cylinder, two-stroke
Power6.0 HP (4.4 kW))
Bore x Stroke39.5 x 40.0 mm (1.6 x 1.6 inches)
Fuel SystemCarburettor
CoolingLiquid
Transmission
GearboxAutomatic
Final DriveChain (final drive)
Chassis
Frame TypeCentral double-cradle-type frame
Rake24.0°
Front SuspensionMarzocchi Ø 32 mm
Rear SuspensionWP monoshock
Wheelbase910 mm (35.8 inches)
Ground Clearance220 mm (8.7 inches)
Wheels & Brakes
Front BrakesSingle disc
Front Brake Ø216 mm (8.5 inches)
Rear BrakesExpanding brake (drum brake)
Rear Brake Ø216 mm (8.5 inches)
Dimensions & Weight
Dry Weight37.6 kg (82.9 pounds)
Power/Weight0.1596 HP/kg
Seat Height650 mm (25.6 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
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.
