Engineered by Yamaha for the scooter motorcycle segment, the 2018 Yamaha BWS 125 relies on a 125 cc (7.6 cu in) air-cooled single cylinder, four-stroke powerplant. In factory specification, maximum torque reaches 10 Nm (7.4 lb-ft) at 7,000 rpm, transferring power to the rear wheel through a automatic gearbox and belt final drive. Internal engine geometry specifies a bore and stroke of 52.4 x 57.9 mm (2.1 x 2.3 inches) with a 10.0:1 compression ratio.
On the scales, the BWS 125 measures 119 kg (262 lbs) wet (curb). 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, combined with a 1,305 mm (51.4 in) wheelbase engineered for quick, flickable steering geometry. The 6.5-liter (1.7 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 2010 to 2025, allowing buyers to track year-over-year changes in emissions tuning, weight and equipment.
Standover Height
780 mm (30.7 in)
Engine
Displacement125.0 ccm (7.63 cubic inches)
Engine TypeSingle cylinder, four-stroke
Torque10.0 Nm (1.0 kgf-m or 7.4 ft.lbs) @ 7000 RPM
Compression10.0:1
Bore x Stroke52.4 x 57.9 mm (2.1 x 2.3 inches)
Valves/Cylinder4
Fuel SystemInjection. Mikuni 24mm throttle body fuel injection
Fuel ControlSingle Overhead Cams (SOHC)
IgnitionTCI Electric Start
LubricationWet Sump
CoolingAir
Transmission
GearboxAutomatic
Final DriveBelt (final drive)
DrivelineV-belt Spur gear
Chassis
Front SuspensionTelescopic fork
Front Travel78 mm (3.1 inches)
Rear SuspensionAdjustable dual shock unit swingarm
Rear Travel80 mm (3.1 inches)
Wheelbase1305 mm (51.4 inches)
Ground Clearance125 mm (4.9 inches)
Wheels & Brakes
Front Tyre120/70-12
Rear Tyre130/70-12
Front BrakesSingle disc
Front Brake Ø245 mm (9.6 inches)
Rear BrakesSingle disc
Rear Brake Ø200 mm (7.9 inches)
Dimensions & Weight
Weight incl.119.0 kg (262.4 pounds)
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.
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.
