Positioned in Yamaha's naked motorcycle lineup, the 2018 Yamaha YBR125 features a 123 cc (7.5 cu in) air-cooled single cylinder, four-stroke configuration. In factory specification, peak output is rated at 10.1 HP (7.3 kW) at 10,000 rpm while maximum torque reaches 9.6 Nm (7.1 lb-ft) at 6,000 rpm, transferring power to the rear wheel through a 5-speed gearbox and chain final drive. With a specific output of 82.1 HP per liter and a 4,000 rpm working window between peak torque (6,000 rpm) and peak power (10,000 rpm), the engine character is indicating a tractable, stress-free state of tune focused on everyday usability and broad torque delivery.
On the scales, the YBR125 measures 126 kg (278 lbs) wet (curb), translating to a power-to-weight ratio of 0.08 HP/kg (12.48 kg per horsepower). Rider ergonomics and chassis geometry center around a 795 mm (31.3 in) seat height — offering a neutral standover height that accommodates most average-inseam riders without sacrificing cornering clearance, combined with a 1,300 mm (51.2 in) wheelbase engineered for quick, flickable steering geometry. The 13.6-liter (3.6 US gal) fuel tank supports practical everyday commuting and weekend road stints.
Within MotoLibrary's Yamaha archive, this model family spans 10 indexed model years from 2008 to 2018, allowing buyers to track year-over-year changes in emissions tuning, weight and equipment.
Specific Output
82.1 HP/L
Power-to-Weight
0.08 HP/kg (12.48 kg/HP)
Power Band Window
6,000–10,000 rpm
Standover Height
795 mm (31.3 in)
Engine
Displacement123.0 ccm (7.51 cubic inches)
Engine TypeSingle cylinder, four-stroke
Engine DetailsForward-inclined single cylinder
Power10.1 HP (7.3 kW)) @ 10000 RPM
Torque9.6 Nm (1.0 kgf-m or 7.1 ft.lbs) @ 6000 RPM
Compression10.0:1
Bore x Stroke54.0 x 54.0 mm (2.1 x 2.1 inches)
Valves/Cylinder2
Fuel SystemCarburettor
Fuel ControlSingle Overhead Cams (SOHC)
IgnitionDC CDI
LubricationWet sump
CoolingAir
Transmission
Gearbox5-speed
Final DriveChain (final drive)
ClutchWet, multiple-disc coil spring
DrivelineConstant Mesh
Chassis
Frame TypeSteel, diamond shaped
Rake26.4°
Trail90 mm (3.5 inches)
Front SuspensionTelescopic forks
Front Travel120 mm (4.7 inches)
Rear SuspensionSwingarm
Rear Travel105 mm (4.1 inches)
Wheelbase1300 mm (51.2 inches)
Ground Clearance160 mm (6.3 inches)
Wheels & Brakes
Front Tyre2.75-18
Rear Tyre90/90-18
Front BrakesSingle disc
Front Brake Ø245 mm (9.6 inches)
Rear BrakesExpanding brake (drum brake)
Rear Brake Ø130 mm (5.1 inches)
Dimensions & Weight
Weight incl.126.0 kg (277.8 pounds)
Seat Height795 mm (31.3 inches) If adjustable, lowest setting.
Overall Height1100 mm (43.3 inches)
Overall Length2065 mm (81.3 inches)
Overall Width730 mm (28.7 inches)
Fuel Capacity13.60 litres (3.59 US gallons)
Oil Capacity1.10 litres (1.16 US quarts)
Other
StarterElectric
Color OptionsWhite, red, black
InstrumentsAnalogue instrument panel with RPM meter
Use this page to compare this motorcycle by its real specifications, not only by model name. Focus on the details that affect fit, comfort, handling, range and ownership.
Power
Compare engine output with similar motorcycles if acceleration, highway use or two-up riding matters.
Torque
Torque is useful for judging real-world pull, especially for touring, commuting and loaded riding.
Seat Height
Check the seat height against your inseam and riding posture before choosing a motorcycle.
Fuel Capacity
Fuel capacity helps estimate touring range and how often you may need to stop.
Brakes
Brake setup is worth comparing if you ride in traffic, mountains or with a passenger.
Suspension
Suspension details can matter for comfort, road feel and long-distance riding.
Transmission
Transmission and final drive affect maintenance, smoothness and everyday usability.
