Built around KTM's minibike, cross motorcycle platform, the 2006 KTM 50 SX Junior features a 49 cc (3 cu in) liquid-cooled single cylinder, two-stroke configuration. 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 Junior 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 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 4 indexed model years from 2006 to 2009, allowing buyers to track year-over-year changes in emissions tuning, weight and equipment.
Standover Height
585 mm (23 in)
Engine
Displacement49.0 ccm (2.99 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. Dell´Orto PHVA 14DS
IgnitionSeletra analogue
Lubrication0,15- 0,2 l Motorex ATF Super
CoolingLiquid
Transmission
ClutchCentrifugal clutch (adjustable)
Performance
ExhaustAluminum
Chassis
Frame TypeCentral double-cradle-type frame
Rake24.0°
Front SuspensionMarzocchi 32 mm (1.26 inches)
Rear SuspensionWP monoshock
Wheelbase910 mm (35.8 inches)
Ground Clearance220 mm (8.7 inches)
Wheels & Brakes
Front BrakesSingle disc
Front Brake Ø160 mm (6.3 inches)
Rear BrakesExpanding brake (drum brake)
Dimensions & Weight
Dry Weight37.6 kg (82.9 pounds)
Seat Height585 mm (23.0 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.
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.
