Engineered by Yamaha for the naked motorcycle segment, the 2005 Yamaha YBR 125 utilizes a 125 cc (7.6 cu in) air-cooled single cylinder, four-stroke layout. In factory specification, peak output is rated at 10 HP (7.3 kW) at 8,000 rpm while maximum torque reaches 10 Nm (7.4 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 80 HP per liter and a 2,000 rpm working window between peak torque (6,000 rpm) and peak power (8,000 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 YBR 125 measures 106 kg (234 lbs) dry, translating to a power-to-weight ratio of 0.09 HP/kg (10.6 kg per horsepower). Rider ergonomics and chassis geometry center around a 780 mm (30.7 in) seat height — offering a neutral standover height that accommodates most average-inseam riders without sacrificing cornering clearance. The 12-liter (3.2 US gal) fuel tank paired with a rated consumption of 2.5 L/100 km provides an estimated theoretical range of roughly 480 km (298 miles) between fill-ups, while factory top speed is listed at 100 km/h (62 mph).
Within MotoLibrary's Yamaha archive, this model family spans 4 indexed model years from 2005 to 2010, allowing buyers to track year-over-year changes in emissions tuning, weight and equipment.
Specific Output
80 HP/L
Power-to-Weight
0.09 HP/kg (10.6 kg/HP)
Power Band Window
6,000–8,000 rpm
Theoretical Range
~480 km (298 mi)
Engine
Displacement125.0 ccm (7.63 cubic inches)
Engine TypeSingle cylinder, four-stroke
Engine DetailsSingle cylinder, four-stroke
Power10.0 HP (7.3 kW)) @ 8000 RPM
Torque10.0 Nm (1.0 kgf-m or 7.4 ft.lbs) @ 6000 RPM
Compression10.0:1
Bore x Stroke54.0 x 54.0 mm (2.1 x 2.1 inches)
Fuel SystemCarburettor. Mikuni VM22SH/1
Fuel ControlSingle Overhead Cams (SOHC)
IgnitionElectronic
CoolingAir
Transmission
Gearbox5-speed
Final DriveChain (final drive)
Performance
Top Speed100.0 km/h (62.1 mph)
Fuel Consumption2.50 litres/100 km (40.0 km/l or 94.09 mpg)
Greenhouse Gases58.0 CO2 g/km. (CO2 - Carbon dioxide emission)
Wheels & Brakes
Front Tyre2.75-18 42P
Rear Tyre90/90-18M/C 57P
Front BrakesSingle disc
Front Brake Ø245 mm (9.6 inches)
Rear BrakesExpanding brake (drum brake)
Rear Brake Ø130 mm (5.1 inches)
Dimensions & Weight
Dry Weight106.0 kg (233.7 pounds)
Power/Weight0.0943 HP/kg
Seat Height780 mm (30.7 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.
Weight
Compare weight carefully because it affects low-speed handling, parking and confidence.
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.
Transmission
Transmission and final drive affect maintenance, smoothness and everyday usability.
