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2023 Yamaha YZ125X Overview
For 2023, Yamaha offers the YZ125X as an enduro / off-road motorcycle with 125 cc on tap. The 2023 Yamaha YZ125X is built around a Single cylinder, two-stroke engine, a compression ratio of 10.2:1. Internally, bore and stroke are 54 x 54.5 mm. In everyday use, the 2023 YZ125X tips the scales at 96.2 kg, carries a 6.81-litre fuel tank, offers a seat height of 970 mm and spans a 1455 mm wheelbase. That's roughly 102.6 kg lighter than the average enduro / off-road motorcycle in our database. Every technical detail, from suspension travel to tyre sizes, is covered in the full 2023 Yamaha YZ125X spec sheet below.
2023 YZ125X - Pros & Cons
Strengths
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Factory engineering: There's nothing exotic about the 2023 Yamaha YZ125X's spec sheet - just solid, proven engineering for what it's meant to do.
Considerations
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Carburetor fuelling: Carburetion is more hands-on than fuel injection - plan on periodic jetting and cleaning as part of routine ownership.
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Tall seat height: A 970 mm seat puts flat-footing out of reach for a lot of riders - sit on it in person before committing.
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Modest fuel capacity: A 6.81-litre tank keeps things light but means budgeting for more frequent fuel stops on any longer ride.
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Chain final drive upkeep: A chain drivetrain is the most common setup in its class, but it's also the one that demands the most regular hands-on maintenance.
Wear Points & Servicing Notes
Carburetor maintenance
Being carbureted, the YZ125X is more sensitive to stale fuel and altitude changes than a fuel-injected bike - a carb clean and rejet restores crisp throttle response after any extended lay-up.
Brake disc and pad wear
Single disc. Hydraulic. up front provides the primary stopping power; inspect disc thickness and pad wear at each tyre change to catch scoring before it becomes a rotor replacement.
Suspension condition on used examples
Suspension duties are handled by KYB® Speed-Sensitive System inverted fork; fully adjustable up front and KYB® single shock; fully adjustable at the rear. Weeping fork seals aren't a dealbreaker on a used bike, but they're a fair basis for negotiating price.
Final drive maintenance
Chain final drive on the YZ125X means routine lubing and tension checks are part of ownership - skip them and sprocket wear accelerates noticeably.
Frame & chassis check
The Semi-double cradle aluminium chassis holds up well with normal use; on a used bike it's still worth checking the head-stock and swingarm pivot area for impact damage or corrosion.
Low-speed handling
The YZ125X's 96.2 kg kerb weight makes low-speed control noticeably less effort than on a heavier machine.
YZ125X - Buying & Maintenance Guide
What to check before buying
A pre-purchase check on the 2023 Yamaha YZ125X should cover the same ground every time: service history, chain and sprocket condition, and any oil seepage around the casings. Start it from cold if you can - a well-kept YZ125X settles to a smooth idle within seconds.
Oil and filter changes
Oil changes are the cheapest insurance you can buy for a YZ125X's engine - keep to the manufacturer's interval rather than stretching it. The sump holds 0.70 litres, so budget for that volume of quality motorcycle-specific engine oil. Use the viscosity grade the manual specifies, not whatever's on sale.
Carburetor upkeep
A YZ125X that's sat unused is almost always a carb-cleaning job before it runs right again - float bowls and pilot jets first, since they clog before anything else.
2023 Yamaha YZ125X - Frequently Asked Questions
What engine does the 2023 Yamaha YZ125X have?
The 2023 Yamaha YZ125X uses a Single cylinder, two-stroke engine with 125 cc of displacement.
How much does the 2023 Yamaha YZ125X weigh?
The 2023 Yamaha YZ125X weighs 96.2 kg. This is the manufacturer's wet figure.
What is the fuel tank capacity of the 2023 Yamaha YZ125X?
The 2023 Yamaha YZ125X has a 6.81-litre fuel tank. At around 5-6 litres per 100 km, that is roughly 113-136 km between stops.
Is the 2023 Yamaha YZ125X suitable for shorter riders?
The 2023 Yamaha YZ125X has a seat height of 970 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 2023 Yamaha YZ125X have?
The 2023 Yamaha YZ125X uses Single disc. Hydraulic. at the front and Single disc. Hydraulic. at the rear.
What tyre sizes does the 2023 Yamaha YZ125X use?
The front tyre size on the 2023 Yamaha YZ125X is 90/90-21.
How much oil does the 2023 Yamaha YZ125X take?
The 2023 Yamaha YZ125X takes 0.70 litres of engine oil at a full oil and filter change. Always verify against the dipstick or sight glass after filling.
Yamaha YZ125X Spec Evolution
The Yamaha YZ125X was produced across 5 model years (2017-2023). 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 |
2017 |
2020 |
2021 |
2022 |
2023 |
| Wet Weight |
93.5 kg / 206.1 lbs |
94.8 kg / 209.0 lbs |
94.8 kg / 209.0 lbs |
94.8 kg / 209.0 lbs |
96.2 kg / 212.0 lbs |
| Seat Height |
- |
975 mm / 38.4 in. |
975 mm / 38.4 in. |
975 mm / 38.4 in. |
970 mm / 38.2 in. |
| Fuel Capacity |
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 |
| Displacement (cc) |
124.00 cc |
125.0 cc |
125.0 cc |
125.0 cc |
125.0 cc |
| Displacement (ci) |
7.57 cubic inches |
7.63 cubic inches |
7.63 cubic inches |
7.63 cubic inches |
7.63 cubic inches |
| Oil Capacity (Quarts) |
0.05 quarts |
0.74 US quarts |
0.74 US quarts |
0.74 US quarts |
0.74 US quarts |
| Frame Type |
Semi-double cradle aluminium frame |
Semi-double cradle aluminium frame |
Semi-double cradle aluminium frame |
Semi-double cradle aluminium frame |
Semi-double cradle aluminium |
| Wheelbase |
1,443 mm / 56.8 in. |
1455 mm / 57.3 in. |
1455 mm / 57.3 in. |
1455 mm / 57.3 in. |
1455 mm / 57.3 in. |
Key Specifications
Engine
Single cylinder, two-stroke
Power
Not published by manufacturer
Torque
Not published by manufacturer
Top Speed
Not published by manufacturer
Weight
96.2 kg / 212.0 lbs
Fuel Capacity
6.81 litres / 1.80 US gallons
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Full 2023 Yamaha YZ125X Specifications
Colours
Team Yamaha Blue
Warranty
30 Day Limited Factory Warranty
Ground Clearance (in.)
13.8 inches
Ground Clearance (mm)
351 mm
Seat Height
970 mm / 38.2 in.
Wheelbase
1455 mm / 57.3 in.
Height
1285 mm / 50.6 in.
Length
2141 mm / 84.3 in.
Width
825 mm / 32.5 in.
Oil Capacity (l)
0.70 litres
Oil Capacity (Quarts)
0.74 US quarts
Fuel Capacity
6.81 litres / 1.80 US gallons
Wet Weight
96.2 kg / 212.0 lbs
Bore x Stroke (in,)
2.1 x 2.1 inches
Bore x Stroke (mm)
54.0 x 54.5 mm
Displacement (cc)
125.0 cc
Displacement (ci)
7.63 cubic inches
Engine Type
Single cylinder, two-stroke
Engine Detail
Reed-valve-inducted
Fuel System
Carburettor. Hitachi Astemo® Keihin PWK38S
Compression Ratio
10.2:1
Engine Lubrication
Premix
Ignition
CDI
Starter
Kick
Clutch
O-ring chain
Final Drive
Chain (final drive)
Gearbox
6-speed
Frame Type
Semi-double cradle aluminium
Suspension - Front
KYB® Speed-Sensitive System inverted fork; fully adjustable
Suspension - Rear
KYB® single shock; fully adjustable
Rake
26.8°
Trail
117 mm / 4.6 in.
Wheel Travel - Front
300 mm / 11.8 in.
Wheel Travel - Rear
315 mm / 12.4 in.
Brakes - Front
Single disc. Hydraulic.
Brakes - Rear
Single disc. Hydraulic.
Rims
Dunlop® Geomax MX33 tires
Tyres - Front
90/90-21
Specifications are compiled from manufacturer documentation and cross-referenced
technical sources, and corrected on an ongoing basis.
Spot an error? Let us know.
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