Engineered by KTM for the minibike, cross motorcycle segment, the 2003 KTM 50 SX Pro Junior LC relies on a 49.8 cc (3 cu in) liquid-cooled single cylinder, two-stroke powerplant. 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 585 mm (23 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 2-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
585 mm (23 in)
Engine
Displacement49.8 ccm (3.04 cubic inches)
Engine TypeSingle cylinder, two-stroke
Engine DetailsSingle cylinder, two-stroke
Bore x Stroke39.5 x 40.0 mm (1.6 x 1.6 inches)
Fuel SystemCarburettor
CoolingLiquid
Transmission
Final DriveChain (final drive)
Chassis
Front Travel140 mm (5.5 inches)
Rear Travel205 mm (8.1 inches)
Wheelbase910 mm (35.8 inches)
Ground Clearance220 mm (8.7 inches)
Wheels & Brakes
Front Tyre2.75-10
Rear Tyre2.50-10
Front BrakesSingle disc
Front Brake Ø160 mm (6.3 inches)
Rear BrakesExpanding brake (drum brake)
Rear Brake Ø90 mm (3.5 inches)
Dimensions & Weight
Dry Weight37.6 kg (82.9 pounds)
Seat Height585 mm (23.0 inches) If adjustable, lowest setting.
Alt. Seat Height610 mm (24.0 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.
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.
