Back to Bike FinderYears: 2009 · 2008 · 2007 · 2006
KTM 50 SX Junior
2009Minibike

KTM 50 SX Junior

Key specifications

Engine
49 cc
Weight
38 kg
Fuel type
petrol
Fuel capacity
0.6 L
Transmission
Automatic
Seat height
24 mm
Front brakes
Single disc
Rear brakes
Single disc

Overview

Introducing the 2009 KTM 50 SX Junior, a pint-sized powerhouse designed specifically for budding motocross enthusiasts. This minibike-cross machine is not just any entry-level motorcycle; it’s a meticulously crafted platform for young riders to hone their skills and experience the thrill of off-road riding. With KTM’s legendary racing pedigree behind it, the 50 SX Junior stands out in the market as a top choice for children looking to take their first steps into the world of competitive riding. Its vibrant orange and black design not only screams style but also embodies the spirited attitude of the KTM brand. At the heart of this remarkable machine is a robust single-cylinder, two-stroke engine with a displacement of 49 ccm, offering young riders an exhilarating ride while ensuring manageable power delivery. With a compression ratio of 12.5:1 and a bore and stroke measuring 39.5 x 40.0 mm, the engine provides a snappy response that allows for quick acceleration and nimble handling. The Dell'Orto PHVA 14 DS carburettor ensures precise fuel delivery, while the liquid cooling system maintains optimal operating temperatures even during extended rides. The automatic gearbox, complemented by an adjustable centrifugal clutch, simplifies the riding experience, enabling young riders to focus on developing their technique rather than wrestling with complicated gear changes. The chassis of the 2009 KTM 50 SX Junior is designed for agility and stability, featuring a central double-cradle-type frame with a steel subframe that balances durability and lightweight construction. The Marzocchi front suspension offers an impressive travel of 205 mm, allowing for excellent shock absorption on rough terrain, while the WP monoshock rear suspension with 125 mm of travel provides a smooth ride over bumps and jumps. The braking system, equipped with single discs both front and rear, ensures reliable stopping power, instilling confidence in young riders as they navigate their surroundings. With a seat height of just 607 mm, this bike is perfectly sized for children, making it accessible for a wide range of riders. In essence, the 2009 KTM 50 SX Junior is more than just a bike; it’s an opportunity for young riders to immerse themselves in the exhilarating world of motocross, laying the groundwork for a lifetime of riding adventures. With its blend of performance, safety, and user-friendly features, this minibike-cross machine is a perfect choice for aspiring champions.

Pros

  • User-Friendly Power Delivery: The automatic gearbox and adjustable centrifugal clutch make it easy for young riders to focus on mastering the basics without being overwhelmed by complex shifting.
  • Durable and Lightweight Frame: The central double-cradle frame design provides stability without adding unnecessary weight, allowing for better maneuverability on the track.
  • High-Quality Suspension: With extensive front and rear suspension travel, the KTM 50 SX Junior can handle rough terrains and jumps, promoting confidence and skill development.

Cons

  • Limited Fuel Capacity: With a fuel tank capacity of only 2.30 litres, riders may find themselves needing to refuel frequently, especially during longer practice sessions.
  • Kick Start Only: The traditional kick starter may be less convenient for younger riders who may struggle with the technique, especially after a fall.
  • Not Suitable for Adult Riders: This model is specifically designed for children, limiting its usability as riders grow or for adults looking for a lightweight trail bike.

Technical details

Source specification data

Make
KTM
Model
50 SX Junior
Category
Minibike-cross
Starter
Kick
Comments
Intended for children.
Color Options
Orange/Black
Clutch
Centrifugal clutch (adjustable)
Gearbox
Automatic
Ignition
Seletra analogue
Fuel System
Carburettor. Dell´Orto PHVA 14 DS
Bore X Stroke
39.5 x 40.0 mm (1.6 x 1.6 inches)
Compression
12.5:1
Displacement
49.00 ccm (2.99 cubic inches)
Cooling System
Liquid
Engine Details
Single cylinder, two-stroke
Exhaust System
Aluminium
Lubrication System
Mixture lubrication
Dry Weight
37.6 kg (82.9 pounds)
Seat Height
607 mm (23.9 inches) If adjustable, lowest setting.
Fuel Capacity
2.30 litres (0.61 gallons)
Ground Clearance
220 mm (8.7 inches)
Rake
24.0°
Trail
140 mm (5.5 inches)
Rear Tyre
2.75-10
Frame Type
Central
double-cradle-type frame.
Steel
subframe.
Front Tyre
2.5-10
Rear Brakes
Single disc
Front Brakes
Single disc
Rear Suspension
WP monoshock
Front Suspension
Marzocchi
Rear Wheel Travel
125 mm (4.9 inches)
Front Wheel Travel
205 mm (8.1 inches)
Rear Brakes Diameter
140 mm (5.5 inches)
Front Brakes Diameter
160 mm (6.3 inches)

Available colors

Orange/Black