Engineered by Yamaha for the enduro - offroad motorcycle segment, the 2018 Yamaha AG125 relies on a 124 cc (7.6 cu in) liquid-cooled single cylinder, four-stroke powerplant. Internal engine geometry specifies a bore and stroke of 54.0 x 54.0 mm (2.1 x 2.1 inches) with a 10.0:1 compression ratio.
On the scales, the AG125 measures 113 kg (249 lbs) wet (curb). Rider ergonomics and chassis geometry center around a 800 mm (31.5 in) seat height — offering a neutral standover height that accommodates most average-inseam riders without sacrificing cornering clearance, combined with a 1,350 mm (53.1 in) wheelbase engineered for quick, flickable steering geometry. The 11-liter (2.9 US gal) fuel tank supports practical everyday commuting and weekend road stints.
Within MotoLibrary's Yamaha archive, this model family spans 4 indexed model years from 2018 to 2022, allowing buyers to track year-over-year changes in emissions tuning, weight and equipment.
Standover Height
800 mm (31.5 in)
Engine
Displacement124.0 ccm (7.57 cubic inches)
Engine TypeSingle cylinder, four-stroke
Engine DetailsSingle cylinder, four-stroke
Compression10.0:1
Bore x Stroke54.0 x 54.0 mm (2.1 x 2.1 inches)
IgnitionCDI
LubricationWet Sump
CoolingLiquid
Transmission
Final DriveChain (final drive)
Chassis
Frame TypeSemi double cradle
Front SuspensionTelescopic forks
Front Travel180 mm (7.1 inches)
Rear SuspensionSwingarm
Rear Travel130 mm (5.1 inches)
Wheelbase1350 mm (53.1 inches)
Ground Clearance225 mm (8.9 inches)
Wheels & Brakes
Front Tyre3.00-19
Rear Tyre3.50-18
Front BrakesExpanding brake (drum brake)
Rear BrakesExpanding brake (drum brake)
Dimensions & Weight
Weight incl.113.0 kg (249.1 pounds)
Seat Height800 mm (31.5 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.
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.
