Motocross Bikes
2005Yamaha YZ125
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The 2005 Yamaha YZ 125 is a lightweight two-stroke motocross bike designed for amateur and intermediate riders entering competitive racing. Known for its aggressive power delivery and nimble handling, it excels in tight technical sections and is considered a stepping stone between 124cc and larger displacement machines. Its compact frame and manageable seat height make it accessible for younger and smaller riders.
- Capacity
- 124.0 ccm
- Engine
- Single, two-stroke
- Gearbox
- 6-speed
- Dry weight
- 86.6 kg
- Seat height
- 993 mm
- Power
- Not on record
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What’s new for the 2005 Yamaha YZ125
vs the 2004| Spec | 2004 | 2005 |
|---|---|---|
| Front suspension | Telescopic fork | 48mm Kayaba inverted cartridge fork w/adjustable compression and rebound damping |
| Rear suspension | Swinging arm (Monocross) | Kayaba single shock w/adjustable preload, compression and rebound damping and separate hi/lo-speed compression adjusters |
| Wheelbase | 1438 mm (56.6 inches) | not listed |
Other years
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
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
- Overall length
- 2134 mm
- Overall width
- 828 mm
- Overall height
- 1318 mm
- Seat height
- 993 mm
- Dry weight
- 86.6 kg
- Wet weight
- 94.3 kg
- Fuel capacity
- 7.90 litres
- Ground clearance
- 401 mm
- Oil capacity
- 0.70 litres
Chassis & suspension
- Frame
- Fron
- Front suspension
- 48mm Kayaba inverted cartridge fork w/adjustable compression and rebound damping
- Rear suspension
- Kayaba single shock w/adjustable preload, compression and rebound damping and separate hi/lo-speed compression adjusters
- 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
- 80/80-21
- Rear tyre
- 100/90-19
Other
- Color options
- Team Yamaha Blue/White
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 | 2005 | 2008 | 2015 | 2021 | 2027 |
|---|---|---|---|---|---|---|
| Capacity | 124 cc | 124 cc | 124 cc | 125 cc | 125 cc | 125 cc |
| Dry weight | 88 kg | 87 kg | 86 kg | 86 kg | 86 kg | 86 kg |
| Seat height | 994 mm | 993 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 2005 Yamaha YZ125 has a Capacity of 124.0 ccm (7.57 cubic inches).
How many gears does the Yamaha YZ125 have?
The 2005 Yamaha YZ125 has a Gearbox of 6-speed.
How much does the Yamaha YZ125 weigh?
The 2005 Yamaha YZ125 has a Dry weight of 86.6 kg (190.9 pounds).
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