The Yamaha YBR 125 is a light motorcycle made by Yamaha that succeeds its previous model for this segment, the Yamaha SR125. Introduced in 2005, it comes in naked,^[1] faired and 'custom'^[2] variants. It has a single-cylinder, air-cooled, four-stroke engine, displacing 124 cc (7.6 cu in). Model years up to 2007 use a carburetor system, with 2008 and on models using a fuel injection system.

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Yamaha YBR125

Manufacturer	Yamaha Motor Company
Parent company	Yamaha Corporation
Production	2005–present
Predecessor	Yamaha SR125
Successor	Yamaha YS125
Class	Standard
Engine	124 cc (7.6 cu in), 4-stroke, OHC, air-cooled, single
Bore / stroke	54.0 mm × 54.0 mm (2.13 in × 2.13 in)
Compression ratio	10.0:1
Ignition type	TCI
Transmission	Wet clutch, 5-speed, chain
Frame type	Steel diamond
Suspension	Front:Telescopic fork, Coil spring, Oil damper Rear: Swingarm, Coil spring, Oil damper
Brakes	Front: Disc Rear: Drum
Tyres	Front: 2.75-18 42P, Rear: 90/90-18 M/C 57P
Rake, trail	26°, 90 mm (3.5 in)
Wheelbase	1,290 mm (51 in)
Dimensions	L: 1,985 mm (78.1 in) W: 745 mm (29.3 in) H: 1,080 mm (43 in)
Seat height	780 mm (31 in)
Fuel capacity	13 L (2.9 imp gal; 3.4 US gal)
Related	YBR125G YB125Z DX

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Around 2010, Yamaha introduced the dual sport version of the Yamaha YBR 125. The new model was named Yamaha YBR 125 G, and it featured several off-road improvements. These include: engine and hand guards, higher front fender, anti-collision fender for the headlight and new block pattern tires.

The Yamaha YS125 was announced in February 2017. Primarily a facelift meant to comply with Euro4 standards, Yamaha needed to do a lot of changes to the YBR125 blueprint, justifying the new moniker. The Cylinder stroke was revised from 54mm to 57.9mm, power and fuel economy increased slightly as did fuel tank capacity. Seating position is higher than its predecessor by 15mm, and the clocks are now reminiscent of a Honda CBF125, the styling appears more aggressive and more modern while maintaining that YBR125 look.