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2023 Yamaha R125 Overview
Yamaha R125 is a sport motorcycle, displacing 125 cc. Power comes from a Single cylinder, four-stroke engine running Single Overhead Cams (SOHC) valve actuation, a compression ratio of 11.2:1. Bore and stroke come in at 52 x 58.7 mm. On the performance side, it delivers 11.5 Nm @ 8000 Revolutions of torque. On the road, the 2023 R125 tips the scales at 144 kg, carries a 11-litre fuel tank, offers a seat height of 820 mm and spans a 1325 mm wheelbase. That's roughly 58.3 kg lighter than the average sport motorcycle in our database. The full 2023 Yamaha R125 spec sheet below covers every technical detail, from suspension travel to tyre sizes.
2023 R125 - Pros & Cons
Strengths
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🔧
Fuel injection: Fuel injection means consistent cold starts and clean throttle response without the fussiness of a carbureted setup.
Considerations
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📏
Tall seat height: At 820 mm, shorter riders will likely be on tiptoes at a standstill - worth sitting on one before you buy.
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Modest fuel capacity: Range between stops is limited by the 11-litre tank - plan fuel stops accordingly on longer routes.
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Chain final drive upkeep: Budget time for routine chain maintenance - it's cheap to replace but needs consistent attention to avoid premature sprocket wear.
Wear Points & Servicing Notes
Fuelling & injector care
The fuel injection on the R125 needs little beyond good fuel and periodic use of an injector-cleaner additive - no jetting or float-bowl maintenance to worry about.
Valve clearance checks
With Single Overhead Cams (SOHC) valve gear, the R125 needs periodic clearance checks; caught early they're a cheap adjustment, left unchecked they accelerate valve seat wear.
Brake disc and pad wear
Braking up front comes from Single disc - solid stopping power, with disc and pad wear best checked on the same schedule as tyre changes.
Suspension condition on used examples
The R125's suspension runs KYB Upside-down telescopic fork, 41 mm at the front. The rear uses Swingarm, link-type. Fork-seal condition and rear linkage play are the two things worth checking before buying used.
Final drive maintenance
The R125 uses chain final drive, which is cheap to replace but needs regular cleaning, lubrication and tension checks to get a full service life out of the sprockets.
Frame & chassis check
Built around a Steel deltabox, aluminum swingarm, the R125's chassis is straightforward to inspect: look for corrosion, cracks or repair welds around stress points like the head-stock and swingarm mounts.
R125 - Buying & Maintenance Guide
What to check before buying
Before handing over money for a used 2023 Yamaha R125, cover the fundamentals: service book and oil change history, chain and sprocket wear, and any sign of oil weeping around the casings. Cold-starting it yourself tells you a lot - a healthy R125 should catch quickly and settle into a smooth idle.
Oil and filter changes
Nothing protects a R125's engine like disciplined oil changes - stay on the manufacturer's schedule (roughly every 6,000 km or annually). The sump holds 1.20 litres, so budget for that volume of quality motorcycle-specific engine oil. Match the viscosity grade to what the owner's manual specifies, not what's cheapest.
Fuel system care
Fuel injection on the R125 needs little attention beyond decent fuel and an occasional system-cleaner additive. Anything left standing for three months or more should have its fuel drained and replaced before it varnishes the injectors.
Valve clearance service
Valve clearances are easy to overlook on a used R125 since a bike out of spec doesn't always feel obviously wrong - but the wear it causes is real. Ask the seller for documentation before assuming it's been done.
2023 Yamaha R125 - Frequently Asked Questions
What engine does the 2023 Yamaha R125 have?
The 2023 Yamaha R125 uses a Single cylinder, four-stroke engine with 125 cc of displacement.
How much does the 2023 Yamaha R125 weigh?
The 2023 Yamaha R125 weighs 144 kg. This is the manufacturer's wet figure.
How much power does the 2023 Yamaha R125 make?
The 2023 Yamaha R125 produces 11.5 Nm @ 8000 Revolutions of torque.
What is the fuel tank capacity of the 2023 Yamaha R125?
The 2023 Yamaha R125 has a 11-litre fuel tank. At around 5-6 litres per 100 km, that is roughly 183-220 km between stops.
Is the 2023 Yamaha R125 suitable for shorter riders?
The 2023 Yamaha R125 has a seat height of 820 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 R125 have?
The 2023 Yamaha R125 uses Single disc at the front and Single disc at the rear.
What tyre sizes does the 2023 Yamaha R125 use?
The front tyre size on the 2023 Yamaha R125 is 110/80-17.
How much oil does the 2023 Yamaha R125 take?
The 2023 Yamaha R125 takes 1.20 litres of engine oil at a full oil and filter change. Always verify against the dipstick or sight glass after filling.
Yamaha R125 Spec Evolution
The Yamaha R125 was produced across 3 model years (2021-2023). 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 |
2021 |
2022 |
2023 |
| Seat Height |
825 mm / 32.5 in. |
825 mm / 32.5 in. |
820 mm / 32.3 in. |
| Fuel Capacity |
- |
11.50 litres / 3.04 US gallons |
11.00 litres / 2.91 US gallons |
| Oil Capacity (Quarts) |
1.59 US quarts |
1.27 US quarts |
1.27 US quarts |
| Oil Capacity (l) |
1.50 litres |
1.20 litres |
1.20 litres |
| Ground Clearance (mm) |
155 mm |
155 mm |
160 mm |
| Ground Clearance (in.) |
6.1 inches |
6.1 inches |
6.3 inches |
| Displacement (ci) |
7.61 cubic inches |
7.61 cubic inches |
7.63 cubic inches |
| Displacement (cc) |
124.7 cc |
124.7 cc |
125.0 cc |
Key Specifications
Engine
Single cylinder, four-stroke
Power
Not published by manufacturer
Torque
11.5 Nm (1.2 kgf-m or 8.5 ft.lbs) @ 8000 Revolutions
Top Speed
Not published by manufacturer
Weight
144.0 kg / 317.5 lbs
Fuel Capacity
11.00 litres / 2.91 US gallons
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Full 2023 Yamaha R125 Specifications
Comments
Traction control. Small windscreen.
Colours
Icon Blue, Tech Black
Ground Clearance (mm)
160 mm
Ground Clearance (in.)
6.3 inches
Seat Height
820 mm / 32.3 in.
Wheelbase
1325 mm / 52.2 in.
Height
1145 mm / 45.1 in.
Length
1990 mm / 78.3 in.
Width
715 mm / 28.1 in.
Oil Capacity (Quarts)
1.27 US quarts
Oil Capacity (l)
1.20 litres
Fuel Capacity
11.00 litres / 2.91 US gallons
Wet Weight
144.0 kg / 317.5 lbs
Fuel Control
Single Overhead Cams (SOHC)
Engine Type
Single cylinder, four-stroke
Displacement (ci)
7.63 cubic inches
Displacement (cc)
125.0 cc
CO2
48.7 CO2 g/km. (CO2 - Carbon dioxide emission)
Bore x Stroke (mm)
52.0 x 58.7 mm
Bore x Stroke (in,)
2.0 x 2.3 inches
Fuel System
Injection
Compression Ratio
11.2:1
Emissions
Euro 5
Engine Lubrication
Wet sump
Fuel Consumption
2.10 litres/100 km (47.6 km/l or 112.01 mpg)
Ignition
TCI
Starter
Electric
Valve System
4
Clutch
Wet, multiple-disc
Final Drive
Chain (final drive)
Gearbox
6-speed
Primary Drive
Constant mesh
Frame Type
Steel deltabox, aluminum swingarm
Suspension - Front
KYB Upside-down telescopic fork, 41 mm
Suspension - Rear
Swingarm, link-type
Rake
26.0°
Trail
95 mm / 3.7 in.
Wheel Travel - Front
130 mm / 5.1 in.
Wheel Travel - Rear
110 mm / 4.3 in.
Instrumentation
5 inch TFT colour instruments
Lighting system
LED headlight
Brakes - Front
Single disc
Brakes - Rear
Single disc
Rims
Y-spoke wheels
Tyres - Front
110/80-17
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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