Motocross Bikes
2004KTM 125 SX
26 fields on record
The 2004 KTM 125 SX is a lightweight motocross bike designed for junior riders and beginners entering competitive racing. Its compact frame, low seat height, and responsive 124cc two-stroke engine deliver excellent maneuverability and acceleration on the track. The 125 SX is renowned for being an accessible entry point into KTM's competitive motocross lineup.
- Capacity
- 124.8 ccm
- Engine
- Single single, two-stroke
- Gearbox
- 5-speed
- Dry weight
- 93.6 kg
- Seat height
- 925 mm
- Power
- 15.0 HP
What’s new for the 2004 KTM 125 SX
vs the 2003| Spec | 2003 | 2004 |
|---|---|---|
| Engine capacity | 124.80 ccm (7.62 cubic inches) | 124.8 ccm (7.62 cubic inches) |
| Power | 15.0 HP (estimated - EU/UK A1-licence power-restricted range, ~11kW cap) | 15.0 HP |
| Fuel capacity | 7.50 litres (1.98 gallons) | 7.50 litres (1.98 US gallons) |
| Front suspension | — | WP-USD 48/26 MA/PA |
| Rear suspension | — | WP-PDS-DA shock absorber |
| Wheelbase | 1,461 mm (57.5 inches) | 1471 mm (57.9 inches) |
Other years
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2025
2026
2027
How it rides
Editorial estimate from the spec sheet - not lab tested- Best for
- Built purely for closed-course motocross racing, it excels at jumps, berms, and rapid direction changes on dirt tracks rather than any street use.
- Built for
- Light, explosive, and razor-sharp in handling, it rewards aggressive riding with a peaky two-stroke power band and minimal weight to manage.
- Not ideal for
- It is not suitable for commuting, highway travel, passengers, or riders seeking comfort, storage, or a forgiving low-end power delivery.
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
- 124.8 ccm
- Power
- 15.0 HP
- Engine type
- Single single, two-stroke
- Power/weight ratio
- 0.1603 HP/kg
- Bore x stroke
- 54.0 x 54.5 mm
- Cooling system
- Liquid
- Fuel system
- Carburettor
Transmission
- Gearbox
- 5-speed
- Transmission type
- Manual
- Final drive
- Chain
Dimensions & weight
- Wheelbase
- 1471 mm
- Seat height
- 925 mm
- Dry weight
- 93.6 kg
- Fuel capacity
- 7.50 litres
- Ground clearance
- 390 mm
Chassis & suspension
- Frame
- Chromium molybdenum
- Front suspension
- WP-USD 48/26 MA/PA
- Rear suspension
- WP-PDS-DA shock absorber
- Rake (fork angle)
- 24.0°
- Trail
- 63 mm
Brakes & wheels
- Front brakes
- Single disc
- Front brakes diameter
- 216 mm
- Rear brakes
- Single disc
- Rear brakes diameter
- 260 mm
Other
- Color options
- Orange
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 | 2009 | 2015 | 2020 | 2027 |
|---|---|---|---|---|---|---|
| Capacity | 124.80 ccm (7.62 cubic inches) | 124.80 ccm (7.62 cubic inches) | 124.80 ccm (7.62 cubic inches) | 124.80 ccm (7.62 cubic inches) | 124.8 ccm (7.62 cubic inches) | 124.8 ccm (7.6 cubic inches) |
| Dry weight | 93.6 kg (206.4 pounds) | 93.6 kg (206.4 pounds) | 90.8 kg (200.2 pounds) | 90.8 kg (200.2 pounds) | 137.0 kg (302.0 pounds) | 92.4 kg (204 pounds) |
| Seat height | 925 mm (36.4 inches) | 925 mm (36.4 inches) | 985 mm (38.8 inches) | 992 mm (39.1 inches) | — | 958 mm |
| Fuel capacity | 7.50 litres (1.98 gallons) | 7.50 litres (1.98 gallons) | 8.00 litres (2.11 gallons) | 7.50 litres (1.98 gallons) | — | 7.2 l |
| Color options | — | Orange | Orange/black | Orange/black | White, Orange | — |
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 125 SX?
The 2004 KTM 125 SX has a Capacity of 124.8 ccm (7.62 cubic inches).
What engine power does the KTM 125 SX have?
The 2004 KTM 125 SX has a Power of 15.0 HP.
How many gears does the KTM 125 SX have?
The 2004 KTM 125 SX has a Gearbox of 5-speed.
How much does the KTM 125 SX weigh?
The 2004 KTM 125 SX has a Dry weight of 93.6 kg (206.4 pounds).
Shop this bike
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The 2004 KTM 125 SX is a powerful and agile motocross bike that offers impressive performance on the track. With its 125cc engine, this bike delivers exceptional power and torque, allowing riders to zip through turns and navigate rough terrain with ease. Additionally, the lightweight design of the KTM 125 SX makes it a breeze to maneuver, giving riders a competitive edge during races.
Overall, the 2004 KTM 125 SX is a top-notch motocross bike that delivers outstanding performance and handling. Whether you're a beginner or an experienced rider, this bike is a great option for those looking to dominate the motocross track. With its powerful engine and nimble design, the KTM 125 SX is a force to be reckoned with on the track.
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