KTM 50 SX Junior - 2007 Specifications and Reviews
The 2007 KTM 50 SX Junior is a lightweight minibike designed for young riders entering motorsports, featuring a simple 49cc liquid-cooled two-stroke engine with kick-start and adjustable centrifugal clutch. Known for its proven reliability and agile handling, this entry-level machine excels in off-road environments and junior racing circuits. Its minimal weight and forgiving character make it ideal for developing fundamental riding skills.
Engine and Transmission Specifications | |
| Clutch | Centrifugal clutch (adjustable) |
| Transmission typefinal drive | Chain |
| Cooling system | Liquid |
| Lubrication system | Mixture 1:60 |
| Starter | Kick |
| 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) |
| Stroke | 2 |
| Engine type | Single cylinder |
| Capacity: | 49.00 ccm (2.99 cubic inches) |
| | |
Physical measures and capacities | |
| Wheelbase | 910 mm (35.8 inches) |
| Ground clearance | 220 mm (8.7 inches) |
| Seat height | 585 mm (23.0 inches) If adjustable, lowest setting. |
| Dry weight | 37.6 kg (82.9 pounds) |
KTM 50 SX Junior dimensions and frame | |
| Exhaust system | Aluminium |
| Rear brakes diameter | 90 mm (3.5 inches) |
| Rear brakes | Expanding brake (drum brake) |
| Front brakes diameter | 160 mm (6.3 inches) |
| Front brakes | Single disc |
| Rear suspension travel | 185 mm (7.3 inches) |
| Rear suspension | WP monoshock |
| Front suspension travel | 115 mm (4.5 inches) |
| Front suspension | Marzocchi, 32 mm (1.26 |
| Rake (fork angle) | 24.0° |
| Frame type | Central double-cradle-type frame |
Speed and acceleration | |
| Fuel capacity | 1.80 litres (0.48 gallons) |
| Category | Minibike, cross |
| Year | 2007 |
| Model | KTM 50 SX Junior |
Other specs | |
| Maintenance | Find 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 For | This 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. |
| Purpose | It exists purely to teach small children the basics of off-road motorcycling in a safe, low-power, automatic-clutch package. |
| Rider Fit | Its 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. |
| Character | 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. |
Character map is an editorial estimate based on this bike's specifications, not a lab-tested measurement.
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Rider Reviews
Total comments: 1

MotorcycleDB Review
The 2007 KTM 50 SX Junior is a little gem that packs a powerful punch for its size. Arguably one of the best models in the mini dirt bike market, this machine boasts a 2-stroke engine, automatic transmission and a sturdy chassis that ensures durability and longevity. Optimized for young riders, the KTM 50 SX Junior offers superb handling, and unparalleled throttle response, providing a smooth and controlled riding experience. Its compact size coupled with its impressive acceleration and top speed make this bike a fantastic choice for beginner riders. The hydraulic disc brakes give young riders the safety needed to develop confidence in their riding abilities. What really sets the 2007 KTM 50 SX Junior apart is its premium build quality. Trustworthy and reliable, this bike requires minimal maintenance, letting young riders spend more time on the dirt and less time in the garage. It has adjustable suspension which allows for customization based on the rider’s weight and the terrain, further enhancing its versatility and usability. The bike's innovative design and stellar performance easily rank it among the top contenders in the 50cc class. Overall, the 2007 KTM 50 SX Junior offers a fantastic off-road riding experience for young motorcyclists, combining power, control, and reliability in a compact and stylish package.Add a Comment
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