2009KTM 50 SX Junior

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The 2009 KTM 50 SX Junior is an entry-level minibike designed for young riders beginning their off-road journey. Powered by a liquid-cooled 49cc two-stroke engine with automatic transmission, it delivers accessible performance and easy handling. Known for its reliability and aggressive styling, the SX Junior remains the ideal choice for aspiring motocross competitors aged 4-8 years.

Capacity: 49.0 ccm
Engine: Single, two-stroke
Gearbox: Not on record
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Dry weight: 37.6 kg
Seat height: 607 mm
Power: 5.4 HP (4.0 kW)

⇄ Compare with another bike All model years

What’s new for the 2009 KTM 50 SX Junior

vs the 2008

Spec	2008	2009
Seat height	585 mm (23.0 inches)	607 mm (23.9 inches)
Fuel capacity	1.80 litres (0.48 US gallons)	2.30 litres (0.61 US gallons)
Front brakes	Single disc. Bremo	Single disc
Rear brakes	Expanding brake (drum brake). Bremo	Single disc

Other years 2006 2007 2008 2009

How it rides

Editorial estimate from the spec sheet - not lab tested

Off-road & trail65%

Cornering30%

City riding5%

Daily riding5%

Touring5%

Two-up0%

Track10%

Best for: It exists purely to teach small children the basics of off-road motorcycling in a safe, low-power, automatic-clutch package.
Built for: Simple, forgiving, and non-intimidating, this minibike is designed to build confidence with gentle power delivery and no manual shifting required.
Not ideal for: It is not suitable for teenagers, adults, road use, or anyone seeking real speed, power, or long-distance capability.

Scores are derived from the spec sheet using the same model across every bike, so they compare like for like.

Will it fit you?

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Your height

Inseam (optional)

Units

At 607mm, a rider of 68.9" with a 31" (estimated) inseam will reach the ground with both feet flat on the 2009 KTM 50 SX Junior, with a cramped knee angle of around 50 degrees and an upright riding position.

Assumes about 30mm of suspension sag once seated. This is an approximation from category-typical geometry, not a measurement of this bike or of you - sit on one before you buy.

More bikes at 750 mm or under — Short Kings →

Find bikes that fit your height →

Full specifications

Engine

Capacity: 49.0 ccm
Power: 5.4 HP (4.0 kW)
Engine type: Single, two-stroke
Power/weight ratio: 0.1436 HP/kg
Bore x stroke: 39.5 x 40.0 mm
Compression: 12.5:1
Cooling system: Liquid
Fuel system: Carburettor
Starting: Kick
Ignition: Seletra analogue
Lubrication system: Mixture lubrication

Transmission

Transmission type: Automatic
Final drive: Chain
Clutch: Centrifugal clutch (adjustable)

Dimensions & weight

Wheelbase: 910 mm
Seat height: 607 mm
Dry weight: 37.6 kg
Fuel capacity: 2.30 litres
Ground clearance: 220 mm

Chassis & suspension

Frame: Central double-cradle-type frame. Steel subframe.
Front suspension: Marzocchi
Rear suspension: WP monoshock
Front wheel travel: 205 mm
Rear wheel travel: 125 mm
Rake (fork angle): 24.0°
Trail: 140 mm

Brakes & wheels

Front brakes: Single disc
Front brakes diameter: 160 mm
Rear brakes: Single disc
Rear brakes diameter: 140 mm
Front tyre: 2.5-10
Rear tyre: 2.75-10

Other

Color options: Orange/black

Compiled from manufacturer documentation and user contributions, corrected on an ongoing basis. Spotted something wrong? Tell us.

What changed, year to year

Differences highlighted

Specification	2006	2007	2008	2009
Capacity	49.00 ccm (2.99 cubic inches)	49.00 ccm (2.99 cubic inches)	49.00 ccm (2.99 cubic inches)	49.00 ccm (2.99 cubic inches)
Dry weight	37.6 kg (82.9 pounds)	37.6 kg (82.9 pounds)	37.6 kg (82.9 pounds)	37.6 kg (82.9 pounds)
Seat height	585 mm (23.0 inches)	585 mm (23.0 inches)	585 mm (23.0 inches)	607 mm (23.9 inches)
Fuel capacity	1.80 litres (0.48 gallons)	1.80 litres (0.48 gallons)	1.80 litres (0.48 gallons)	2.30 litres (0.61 gallons)
Color options	—	—	—	Orange/black