Motocross Bikes
2008KTM 50 SX Junior
33 fields on record
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.
- Capacity
- 49.0 ccm
- Engine
- Single, two-stroke
- Gearbox
- Not on record
Know it? Add it → - Dry weight
- 37.6 kg
- Seat height
- 585 mm
- Power
- 5.4 HP (4.0 kW)
What’s new for the 2008 KTM 50 SX Junior
vs the 2007| Spec | 2007 | 2008 |
|---|---|---|
| Front suspension | Marzocchi, 32 mm (1.26 | Marzocchi |
| Front brakes | Single disc | Single disc. Bremo |
| Rear brakes | Expanding brake (drum brake) | Expanding brake (drum brake). Bremo |
How it rides
Editorial estimate from the spec sheet - not lab tested- 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?
Worked out in your browser - nothing is sent to usEngine
- Capacity
- 49.0 ccm
- Power
- 5.4 HP (4.0 kW)
- Engine type
- Single, two-stroke
- Power/weight ratio
- 0.1436 HP/kg (dry)
- 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 1:60
Transmission
- Transmission type
- Automatic
- Final drive
- Chain
- Clutch
- Centrifugal clutch (adjustable)
Dimensions & weight
- Wheelbase
- 910 mm
- Seat height
- 585 mm
- Dry weight
- 37.6 kg
- Fuel capacity
- 1.80 litres
- Ground clearance
- 220 mm
Chassis & suspension
- Frame
- Central double-cradle-type frame
- Front suspension
- Marzocchi
- Rear suspension
- WP monoshock
- Front wheel travel
- 120 mm
- Rear wheel travel
- 125 mm
- Rake (fork angle)
- 24.0°
- Trail
- 90 mm
Brakes & wheels
- Front brakes
- Single disc. Bremo
- Front brakes diameter
- 160 mm
- Rear brakes
- Expanding brake (drum brake). Bremo
- Rear brakes diameter
- 90 mm
- Front tyre
- 2.50-10
- Rear tyre
- 2.75-10
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 cc | 49 cc | 49 cc | 49 cc |
| Dry weight | 38 kg | 38 kg | 38 kg | 38 kg |
| Seat height | 585 mm | 585 mm | 585 mm | 607 mm |
| Fuel capacity | 1.8 L | 1.8 L | 1.8 L | 2.3 L |
Illustrative - generated automatically by diffing the year records already on file, not a manufacturer-published changelog.
Rider Reviews
Common questions
What is the engine size of the KTM 50 SX Junior?
The 2008 KTM 50 SX Junior has a Capacity of 49.0 ccm (2.99 cubic inches).
What engine power does the KTM 50 SX Junior have?
The 2008 KTM 50 SX Junior has a Power of 5.4 HP (4.0 kW).
How much does the KTM 50 SX Junior weigh?
The 2008 KTM 50 SX Junior has a Dry weight of 37.6 kg (82.9 pounds).
Shop this bike
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Similar bikes
Same category, weighted similarity
2007 Beta Minicross R10
49 cc · 38 kg · 620 mm
2008 Beta Minicross R10
49 cc · 38 kg · 620 mm
2008 Clipic CJ50 HIT3 Competicio Junior
49 cc · 39 kg · 580 mm
2007 KTM 50 Senior Adventure
49 cc · 38 kg · 650 mm
2007 KTM 50 Mini Adventure
49 cc · 38 kg · 530 mm
2008 Clipic CJ50 HIT3 Replica Junior
49 cc · 38 kg · 530 mm
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