Motocross Bikes
2003Yamaha YZ125
37 fields on record
The 2003 Yamaha YZ125 is a two-stroke motocross racer from Yamaha's long-running YZ line. Its liquid-cooled 124cc single drives a five-speed gearbox and chain. A very tall 994 mm seat, 94.3 kg wet weight and a 7.9-litre tank make it a light, revvy competition machine.
- Capacity
- 124.0 ccm
- Engine
- Single, two-stroke
- Gearbox
- 6-speed
- Dry weight
- 87.5 kg
- Seat height
- 994 mm
- Power
- Not on record
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Other years
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2003
2004
2005
2006
2007
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2009
2010
2011
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2013
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2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027
How it rides
Editorial estimate from the spec sheet - not lab tested- Best for
- Built purely for motocross track racing and aggressive off-road riding, not for general transportation.
- Built for
- A high-strung, peaky, and razor-sharp machine that thrives on revs and rewards precise throttle and clutch control with explosive acceleration out of corners.
- Not ideal for
- This bike is not for beginners, commuters, passengers, or anyone seeking comfort, storage, or road-legal touring 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
- 124.0 ccm
- Engine type
- Single, two-stroke
- Bore x stroke
- 54.0 x 54.5 mm
- Compression
- 8.7:1
- Cooling system
- Liquid
- Fuel system
- Carburettor
- Starting
- Electric
- Ignition
- CDI
- Lubrication system
- Dry sump
- Power
- Not on record - add it
Transmission
- Gearbox
- 6-speed
- Transmission type
- Manual
- Final drive
- Chain
- Clutch
- Multiplate, wet
Dimensions & weight
- Wheelbase
- 1444 mm
- Overall length
- 2130 mm
- Overall width
- 827 mm
- Overall height
- 1311 mm
- Seat height
- 994 mm
- Dry weight
- 87.5 kg
- Wet weight
- 94.3 kg
- Fuel capacity
- 7.90 litres
- Ground clearance
- 400 mm
- Oil capacity
- 0.70 litres
Chassis & suspension
- Frame
- Fron
- Front suspension
- Telescopic fork
- Rear suspension
- Swinging arm (Monocross)
- Front wheel travel
- 300 mm
- Rear wheel travel
- 315 mm
- Rake (fork angle)
- 27.1°
- Trail
- 109 mm
Brakes & wheels
- Front brakes
- Single disc
- Front brakes diameter
- 250 mm
- Rear brakes
- Single disc
- Rear brakes diameter
- 245 mm
- Front tyre
- 80/100-21 51M
- Rear tyre
- 100/90-19 57M
Specs last verified against published sources: .
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 | 2002 | 2003 | 2008 | 2015 | 2021 | 2027 |
|---|---|---|---|---|---|---|
| Capacity | 124 cc | 124 cc | 124 cc | 125 cc | 125 cc | 125 cc |
| Dry weight | 88 kg | 88 kg | 86 kg | 86 kg | 86 kg | 86 kg |
| Seat height | 994 mm | 994 mm | 998 mm | 975 mm | 975 mm | 980 mm |
| Fuel capacity | 7.9 L | 7.9 L | 7.9 L | 8 L | 8 L | 6.8 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 Yamaha YZ125?
The 2003 Yamaha YZ125 has a Capacity of 124.0 ccm (7.57 cubic inches).
How many gears does the Yamaha YZ125 have?
The 2003 Yamaha YZ125 has a Gearbox of 6-speed.
How much does the Yamaha YZ125 weigh?
The 2003 Yamaha YZ125 has a Dry weight of 87.5 kg (192.9 pounds).
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