KTM 50 SX Junior - 2008 Specifications and Reviews

The 2008 KTM 50 SX Junior is a lightweight minibike engineered for young riders transitioning into competitive motocross. Featuring a liquid-cooled 49cc two-stroke single-cylinder engine with automatic transmission and adjustable centrifugal clutch, it delivers responsive power delivery ideal for learning fundamental riding skills. The bike is best known for its robust construction and proven reliability in youth-level off-road racing.

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Engine and Transmission Specifications

ClutchCentrifugal clutch (adjustable)
GearboxAutomatic
Cooling systemLiquid
Lubrication systemMixture lubrication 1:60
StarterKick
IgnitionSeletra analogue
Fuel systemCarburettor. Dell´Orto PHVA 14 DS
Bore x stroke39.5 x 40.0 mm (1.6 x 1.6 inches)
Compression12.5:1
Stroke2
Engine typeSingle cylinder
Capacity:49.00 ccm (2.99 cubic inches)

Physical measures and capacities

Wheelbase910 mm (35.8 inches)
Ground clearance220 mm (8.7 inches)
Seat height585 mm (23.0 inches) If adjustable, lowest setting.
Dry weight37.6 kg (82.9 pounds)
 
 

KTM 50 SX Junior dimensions and frame

Exhaust systemAluminium
Rear brakes diameter90 mm (3.5 inches)
Rear brakesExpanding brake (drum brake). Bremo
Front brakes diameter160 mm (6.3 inches)
Front brakesSingle disc. Bremo
Rear tyre dimensions2.75-10
Front tyre dimensions2.50-10
Rear suspension travel125 mm (4.9 inches)
Rear suspensionWP monoshock
Front suspension travel120 mm (4.7 inches)
Front suspensionMarzocchi
Trail90 mm (3.5 inches)
Rake (fork angle)24.0°
Frame typeCentral double-cradle-type frame

Speed and acceleration

Fuel capacity1.80 litres (0.48 gallons)

CategoryMinibike, cross
Year2008
ModelKTM 50 SX Junior

Other specs

MaintenanceFind parts, fluids, filters, maintenance tools and service items on eBay

Performance Profile & Rider Fit

Best For

Track10%
City5%
Cornering30%
Daily Riding5%
Touring5%
Passenger0%

Rider Profile

Best ForThis is a first-motorcycle machine built specifically for very young children just starting to learn balance and throttle control, not for riders with any prior experience expectations.
PurposeIt exists purely to teach small children the basics of off-road motorcycling in a safe, low-power, automatic-clutch package.
Rider FitIts tiny 607mm seat height, sub-40kg dry weight, and automatic centrifugal clutch make it suitable only for young kids, typically around 4 to 6 years old.
CharacterSimple, forgiving, and non-intimidating, this minibike is designed to build confidence with gentle power delivery and no manual shifting required.
Not Ideal ForIt is not suitable for teenagers, adults, road use, or anyone seeking real speed, power, or long-distance capability.

Character map is an editorial estimate based on this bike's specifications, not a lab-tested measurement.

Rider Reviews

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