The Yamaha YZF-R125 is a sport motorcycle designed by Yamaha and manufactured by MBK Industrie since 2008. In 2023 the model is in its fourth generation.

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Yamaha YZF-R125

Manufacturer	Yamaha Motor Company
Also called	Yamaha R125
Production	2008–
Predecessor	Yamaha TZR125
Class	Sport bike
Engine	124.7 cc (7.61 cu in) liquid-cooled 4-stroke 4-valve SOHC single-cylinder engine[1]
Bore / stroke	52.0 mm × 58.6 mm (2.05 in × 2.31 in)
Compression ratio	11.2:1
Ignition type	TCI[clarification needed]
Transmission	6-speed constant mesh, wet, multiple-disc coil spring clutch, chain drive
Frame type	Steel twin-spar Deltabox
Suspension	Front: 41 mm inverted fork Rear: Swingarm (link type)
Brakes	Hydraulic disc; front: 292 mm floating disc Rear: 230 mm
Tires	Front: 100/80-17 Rear: 130/70-17 (2008-2013) 140/70-17 (2014+)
Rake, trail	25°, 89 mm (3.5 in)
Wheelbase	1,325 mm (52.2 in)
Dimensions	L: 1,990 mm (78 in) W: 755 mm (29.7 in) H: 1,140 mm (45 in)
Seat height	820 mm (32 in)
Fuel capacity	11.0 L (2.4 imp gal; 2.9 US gal)
Oil capacity	1.15 L (0.25 imp gal; 0.30 US gal)

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In 2008, the bike initially came available as a four stroke replacement for the TZR125. Entering the thin market of small displacement 4-stroke sport bikes, it quickly gained traction and became a popular choice for young riders.

In 2014, Yamaha gave a facelift to the model, with a slightly tweaked fairing set, an upside-down front fork and a full LCD dashboard. The model launched without ABS, but it became an option for 2015. To comply with EU motorbike safety regulations, ABS on motorcycles was required on all new motorbikes in the EU from 2017. This may cause minor differences in weight, electric or other specifications.

The 2019 model has a new rear swingarm, changes to the frame and bodywork, a new engine with Variable Valve Actuation (VVA).^{[clarification needed]}
There is a small 2021 update, that adds a vapor canister to the fuel system, presumably to help the bike comply with the more strict Euro 5 emission standard.

The bike yet again received a slight overhaul for the 2023 model year. The changes include some minor tweaks to the suspension like a different caster angle at the front (it is now 26°), and a shorter swingarm travel at the rear (it is now 110 mm down from 114 mm). The front half of the bike has reworked fairings and a new 5” full color TFT dash with smartphone connectivity.