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.
Engine and Transmission Specifications | |
| Clutch | Centrifugal clutch (adjustable) |
| Gearbox | Automatic |
| Cooling system | Liquid |
| Lubrication system | Mixture lubrication 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) |
| Compression | 12.5:1 |
| 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). Bremo |
| Front brakes diameter | 160 mm (6.3 inches) |
| Front brakes | Single disc. Bremo |
| Rear tyre dimensions | 2.75-10 |
| Front tyre dimensions | 2.50-10 |
| Rear suspension travel | 125 mm (4.9 inches) |
| Rear suspension | WP monoshock |
| Front suspension travel | 120 mm (4.7 inches) |
| Front suspension | Marzocchi |
| Trail | 90 mm (3.5 inches) |
| 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 | 2008 |
| 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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