Motocross Bikes
2003KTM 50 SX Pro Senior LC
30 fields on record
The 2003 KTM 50 SX Pro Senior LC is a lightweight minibike designed for young riders progressing to competitive motocross. Its liquid-cooled two-stroke engine and compact chassis deliver responsive handling and agility on tight tracks. Best known for offering an accessible entry point into serious off-road racing for junior competitors.
- Capacity
- 49.8 ccm
- Engine
- Single
- Gearbox
- Not on record
Know it? Add it → - Dry weight
- 38.8 kg
- Seat height
- 650 mm
- Power
- 5.4 HP (4.0 kW)
How it rides
Editorial estimate from the spec sheet - not lab tested- Best for
- Designed to teach small kids the fundamentals of motocross riding in a controlled, low-speed off-road environment.
- Built for
- A miniature but genuine dirt bike with a centrifugal clutch and real suspension components, giving a confidence-inspiring introduction to off-road riding.
- Not ideal for
- This bike is not suitable for teenagers, adults, road use, or anyone seeking speed, comfort, 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
- 49.8 ccm
- Power
- 5.4 HP (4.0 kW)
- Engine type
- Single
- Power/weight ratio
- 0.1392 HP/kg (dry)
- Bore x stroke
- 39.5 x 40.0 mm
- Cooling system
- Liquid
- Fuel system
- Carburettor
- Ignition
- Seletra analogue
Transmission
- Transmission type
- Automatic
- Final drive
- Chain
- Clutch
- Centrifugal clutch (adjustable)
Dimensions & weight
- Wheelbase
- 1030 mm
- Seat height
- 650 mm
- Dry weight
- 38.8 kg
- Fuel capacity
- 2.00 litres
- Ground clearance
- 255 mm
Chassis & suspension
- Frame
- Central double-cradle-type frame
- Front suspension
- Marzocchi 32 mm
- Rear suspension
- WP monoshock
- Front wheel travel
- 185 mm
- Rear wheel travel
- 185 mm
- Rake (fork angle)
- 24.0°
- Trail
- 67 mm
Brakes & wheels
- Front brakes
- Single disc
- Front brakes diameter
- 160 mm
- Rear brakes
- Expanding brake (drum brake)
- Rear brakes diameter
- 90 mm
- Front tyre
- 2.75-12
- Rear tyre
- 2.50-10
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 | 2003 | 2004 | 2005 |
|---|---|---|---|
| Capacity | 50 cc | 49 cc | 49 cc |
| Dry weight | 39 kg | 38 kg | 39 kg |
| Seat height | 650 mm | 650 mm | 650 mm |
| Fuel capacity | 2 L | 1.8 L | 1.8 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 Pro Senior LC?
The 2003 KTM 50 SX Pro Senior LC has a Capacity of 49.8 ccm (3.04 cubic inches).
What engine power does the KTM 50 SX Pro Senior LC have?
The 2003 KTM 50 SX Pro Senior LC has a Power of 5.4 HP (4.0 kW).
How much does the KTM 50 SX Pro Senior LC weigh?
The 2003 KTM 50 SX Pro Senior LC has a Dry weight of 38.8 kg (85.5 pounds).
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