MotoSpecs

2010 Yamaha YZ125 Specifications

Cross / motocross • Specs last verified 13 July 2026

No images available
Tap to enlarge

2010 Yamaha YZ125 Overview

The 2010 Yamaha YZ125 is a cross / motocross motorcycle built around 124 cc of displacement. Under the tank sits a Single cylinder, two-stroke engine, a compression ratio of 8.6:1. The bore and stroke measures 54 x 54.5 mm. From a practical standpoint, the 2010 YZ125 tips the scales at 94.3 kg, carries a 7.94-litre fuel tank, offers a seat height of 998 mm and spans a 1,443 mm wheelbase. That's roughly 11.6 kg lighter than the average cross / motocross motorcycle in our database. Scroll down for the complete 2010 Yamaha YZ125 spec sheet covering every technical detail from suspension travel to tyre sizes.

2010 Yamaha YZ125 compared with other bikes in the Cross / motocross category

Here is how the 2010 Yamaha YZ125 stacks up against other bikes in the Cross / motocross category in our database. Each model counts once, using the model year closest to this one, and the comparison covers up to 224 models.

  • Seat height of 998 mm is taller than that of 194 of the other 199 bikes in the Cross / motocross category.
  • Only 30 of the other 128 bikes in the Cross / motocross category have a lighter wet weight than the 94.3 kg of the YZ125.
  • With 124 cc, the YZ125 has the joint 56th smallest engine displacement of 224 bikes in the Cross / motocross category, 56% below the category average of 280 cc.
  • Narrowing the field to the 111 models within five model years of it, the seat height of 998 mm is taller than that of 108 of the other 110.

Versus the 2009 model

The figures we track are unchanged from the 2009 model: wet weight, displacement and seat height all match.

2010 YZ125 - Pros & Cons

Strengths

  • Strong front braking: The single disc front brake gives excellent stopping power and responds well to aftermarket braided lines.

Considerations

  • Carburetor fuelling: Carbureted engines need occasional jetting attention and can be reluctant in cold weather or at altitude compared to modern fuel-injected alternatives.
  • Tall seat height: The 998 mm seat height will challenge shorter riders - tiptoeing at low speeds is something to factor into your decision.
  • Modest fuel capacity: The 7.94-litre tank means more frequent fuel stops on longer rides, which is worth planning around on touring routes.
  • Chain final drive upkeep: Chain final drive needs regular cleaning, lubrication and tension checks to get full life out of the sprockets.

Wear Points & Servicing Notes

Carburetor maintenance

The YZ125 uses carburetion rather than fuel injection, which means jetting is altitude- and temperature-sensitive and benefits from a clean-and-rejet after extended storage or an exhaust change.

Brake disc and pad wear

The single disc front brake gives strong, progressive stopping power. Disc thickness and pad depth are worth checking at every tyre change, since worn pads can score the disc surface.

Suspension condition on used examples

Up front, the YZ125 runs Speed-sensitive system inverted fork and Fully adjustable single shock at the rear. On a used example, check fork seals for weeping oil and test the rear linkage for play - seals are a relatively cheap fix but useful when negotiating price.

Final drive maintenance

Final drive is by chain - expect to clean and lube it every few hundred kilometres and check tension regularly; a neglected chain wears the sprockets faster than the chain itself.

Low-speed handling

At just 94.3 kg, the YZ125 is light enough to manhandle easily at a standstill - one of the practical advantages of its class.

YZ125 - Buying & Maintenance Guide

What to check before buying

When inspecting a used 2010 Yamaha YZ125 with its 124 cc cross / motocross, start with the basics: check the service book for oil change frequency, inspect the drivetrain for wear, and look for oil seepage around the engine casings and rocker covers. This model runs chain final drive, so check chain slack and sprocket tooth profile specifically - a worn sprocket is a cheaper fix now than after it's chewed up the next chain. Now 16 years old, this cross / motocross is as likely to show age-related wear (perished rubber, seized fasteners, degraded seals) as mileage-related wear. A cold start test is invaluable - a well-maintained YZ125 should fire up cleanly and settle to a smooth idle within a few seconds.

Oil and filter changes

Regular oil changes are the single most important maintenance task for the YZ125's 124 cc single cylinder, two-stroke. Stick to the manufacturer's interval - typically every 6,000 km or once a year, whichever comes first. With an 8.6:1 compression ratio, running the octane grade specified in the manual matters more than on a lower-compression engine. Always use the correct viscosity grade as specified in the owner's manual.

Carburetor upkeep

Keep the carburetors clean and free of deposits. If the YZ125 has been stored, strip and clean the carb float bowls before attempting to start it. Pilot jets are the first to block and the last to be checked - always include them in any carb rebuild.

2010 Yamaha YZ125 - Frequently Asked Questions

What engine does the 2010 Yamaha YZ125 have?
The 2010 Yamaha YZ125 uses a Single cylinder, two-stroke engine with 124 cc of displacement.
How much does the 2010 Yamaha YZ125 weigh?
The 2010 Yamaha YZ125 weighs 94.3 kg. This is the manufacturer's wet figure.
What is the fuel tank capacity of the 2010 Yamaha YZ125?
The 2010 Yamaha YZ125 has a 7.94-litre fuel tank. At around 5-6 litres per 100 km, that is roughly 132-158 km between stops.
Is the 2010 Yamaha YZ125 suitable for shorter riders?
The 2010 Yamaha YZ125 has a seat height of 998 mm. This is towards the tall end of the spectrum and will require most riders under 175 cm to tiptoe at stops.
What brakes does the 2010 Yamaha YZ125 have?
The 2010 Yamaha YZ125 uses single disc at the front and single disc at the rear.
What tyre sizes does the 2010 Yamaha YZ125 use?
The 2010 Yamaha YZ125 runs 80/100-M21 front and 100/90-M19 rear tyres. A good selection of sport, touring and all-weather rubber is available in these sizes.
What fuel system does the 2010 Yamaha YZ125 use?
The 2010 Yamaha YZ125 uses Carburettor. Mikuni® TMX 38, providing precise fuelling across the rev range and reliable cold-start behaviour.

Yamaha YZ125 Spec Evolution

The Yamaha YZ125 was produced across 21 model years (2002-2023). The table below highlights the key specifications that changed across the production run - useful whether you are comparing years or tracking down a specific variant.

Specification 2002 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023
Wet Weight - - - - - - 94.3 kg / 208.0 lbs 94.3 kg / 208.0 lbs 94.4 kg / 208.0 lbs 94.4 kg / 208.0 lbs 93.9 kg / 207.0 lbs 93.9 kg / 207.0 lbs 94.8 kg / 209.0 lbs 94.8 kg / 209.0 lbs 94.8 kg / 209.0 lbs 93.9 kg / 207.0 lbs 93.9 kg / 207.0 lbs 93.9 kg / 207.0 lbs 93.9 kg / 207.0 lbs 94.8 kg / 209.0 lbs 94.8 kg / 209.0 lbs
Dry Weight 87.5 kg / 192.9 lbs 87 kg / 191.8 lbs - 86 kg / 189.6 lbs 86.2 kg / 190.0 lbs 86.2 kg / 190.0 lbs - - - - 210.5 kg / 464.1 lbs 59 kg / 130.1 lbs - - - - - - - - -
Engine Detail - - - - - - - - - Reed-valve inducted Reed-valve-inducted Reed-valve-inducted Reed-valve-inducted Reed-valve-inducted Reed-valve-inducted Reed-valve-inducted Reed-valve-inducted Reed-valve-inducted Reed-valve-inducted Reed-valve-inducted Reed-valve-inducted
Engine Type Single cylinder Single cylinder Single cylinder V2 Single cylinder Single cylinder Single cylinder Single cylinder, two-stroke Single cylinder, two-stroke Single cylinder, two-stroke Single cylinder, two-stroke Single cylinder, two-stroke Single cylinder, two-stroke Single cylinder, two-stroke Single cylinder, two-stroke Single cylinder, two-stroke Single cylinder, two-stroke Single cylinder, two-stroke Single cylinder, two-stroke Single cylinder, two-stroke Single cylinder, two-stroke
Top Speed - - - - - - - - - - - 120.0 km/h / 74.6 mph - - - - 96.0 km/h / 59.7 mph - - - -
Seat Height 994 mm / 39.1 in. 992 mm / 39.1 in. 993 mm / 39.1 in. 998 mm / 39.3 in. 998 mm / 39.3 in. 998 mm / 39.3 in. 998 mm / 39.3 in. 998 mm / 39.3 in. 998 mm / 39.3 in. 998 mm / 39.3 in. 998 mm / 39.3 in. 998 mm / 39.3 in. 975 mm / 38.4 in. 975 mm / 38.4 in. 975 mm / 38.4 in. 975 mm / 38.4 in. 975 mm / 38.4 in. 975 mm / 38.4 in. 975 mm / 38.4 in. 39 mm / 1.5 in. 980 mm / 38.6 in.
Fuel Capacity - - 7.94 litres / 2.10 gallons 8.00 litres / 2.11 gallons 7.94 litres / 2.10 gallons 7.94 litres / 2.10 gallons 7.94 litres / 2.10 gallons 7.94 litres / 2.10 gallons 7.95 litres / 2.10 gallons 7.95 litres / 2.10 gallons 7.95 litres / 2.10 gallons 7.95 litres / 2.10 gallons 7.95 litres / 2.10 gallons 7.95 litres / 2.10 gallons 8.00 litres / 2.11 gallons 8.00 litres / 2.11 gallons 8.00 litres / 2.11 US gallons 8.00 litres / 2.11 US gallons 8.00 litres / 2.11 US gallons 6.81 litres / 1.80 US gallons 6.81 litres / 1.80 US gallons
Oil Capacity (Quarts) - - - - - - - - 0.05 quarts - - - - - 0.05 quarts 0.05 quarts 0.74 US quarts 0.74 US quarts 0.74 US quarts 0.74 US quarts 0.74 US quarts

Key Specifications

Engine

Single cylinder, two-stroke

Power

Not recorded

Torque

Not recorded

Top Speed

Not recorded

Weight

94.3 kg / 208.0 lbs

Fuel Capacity

7.94 litres / 2.10 gallons

Advertisement

Full 2010 Yamaha YZ125 Specifications

Colours Team Yamaha Blue/White
Ground Clearance (in.) 15.2 inches
Ground Clearance (mm) 386 mm
Seat Height 998 mm / 39.3 in.
Wheelbase 1,443 mm / 56.8 in.
Height 1,316 mm / 51.8 in.
Length 2,136 mm / 84.1 in.
Width 828 mm / 32.6 in.
Fuel Capacity 7.94 litres / 2.10 gallons
Wet Weight 94.3 kg / 208.0 lbs
Bore x Stroke (in,) 2.1 x 2.1 inches
Bore x Stroke (mm) 54.0 x 54.5 mm
Displacement (cc) 124.00 cc
Displacement (ci) 7.57 cubic inches
Engine Type Single cylinder, two-stroke
Fuel System Carburettor. Mikuni® TMX 38
Compression Ratio 8.6:1
Ignition CDI
Final Drive Chain
Gearbox 6-speed
Suspension - Front Speed-sensitive system inverted fork
Suspension - Rear Fully adjustable single shock
Wheel Travel - Front 300 mm / 11.8 in.
Wheel Travel - Rear 315 mm / 12.4 in.
Brakes - Front Diameter (in.) 9.8 inches
Brakes - Front Diameter (mm) 250 mm
Brakes - Rear Diameter (in.) 9.6 inches
Brakes - Rear Diameter (mm) 245 mm
Brakes - Front Single disc
Brakes - Rear Single disc
Tyres - Front 80/100-M21
Tyres - Rear 100/90-M19

Specifications are compiled from manufacturer documentation and cross-referenced technical sources, and corrected on an ongoing basis. Spot an error? Let us know.

Advertisement

Compare Yamaha YZ125

See how the 2010 Yamaha YZ125 stacks up against similar motorcycles.

2010 Yamaha YZ125
VS
2014 Honda CRF125F

2010 Yamaha YZ125

vs 2014 Honda CRF125F

Build your own comparison →
Advertisement

Explore More

All Yamaha models All YZ125 years More Cross / motocross All 2010 motorcycles
Advertisement

Yamaha YZ125 - other years

2022 2020 2016 2011 2010
All Yamaha models Cross / motocross Compare bikes