At the heart of the 2012 Yamaha YBR125 Custom custom - cruiser motorcycle, Yamaha features a 124 cc (7.6 cu in) air-cooled single cylinder, four-stroke configuration. In factory specification, peak output is rated at 10.1 HP (7.3 kW) at 7,800 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. With a specific output of 81.5 HP per liter and a 1,800 rpm working window between peak torque (6,000 rpm) and peak power (7,800 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 Custom measures 129 kg (284 lbs) wet (curb), translating to a power-to-weight ratio of 0.08 HP/kg (12.77 kg per horsepower). Rider ergonomics and chassis geometry center around a 760 mm (29.9 in) seat height — giving shorter riders and urban commuters confident flat-foot reach at traffic stops, combined with a 1,290 mm (50.8 in) wheelbase engineered for quick, flickable steering geometry. The 12-liter (3.2 US gal) fuel tank supports practical everyday commuting and weekend road stints.
Within MotoLibrary's Yamaha archive, this model family spans 9 indexed model years from 2008 to 2017, allowing buyers to track year-over-year changes in emissions tuning, weight and equipment.
Specific Output
81.5 HP/L
Power-to-Weight
0.08 HP/kg (12.77 kg/HP)
Power Band Window
6,000–7,800 rpm
Standover Height
760 mm (29.9 in)
Engine
Displacement124.0 ccm (7.57 cubic inches)
Engine TypeSingle cylinder, four-stroke
Engine DetailsForward-inclined single cylinder
Power10.1 HP (7.3 kW)) @ 7800 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 SystemInjection
Fuel ControlSingle Overhead Cams (SOHC)
CoolingAir
Transmission
Gearbox5-speed
ClutchWet, multiple-disc coil spring
Performance
ExhaustChrome-plated slash-cut muffler
Chassis
Frame TypeDiamond Shaped, steel
Trail90 mm (3.5 inches)
Front SuspensionTelescopic forks
Front Travel120 mm (4.7 inches)
Rear SuspensionLink suspension
Rear Travel105 mm (4.1 inches)
Wheelbase1290 mm (50.8 inches)
Ground Clearance140 mm (5.5 inches)
Wheels & Brakes
Front Tyre3.00-18
Rear Tyre3.50-16
Front BrakesDouble disc. Hydraulic
Front Brake Ø245 mm (9.6 inches)
Rear BrakesExpanding brake (drum brake)
Rear Brake Ø130 mm (5.1 inches)
Dimensions & Weight
Weight incl.129.0 kg (284.4 pounds)
Seat Height760 mm (29.9 inches) If adjustable, lowest setting.
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.
