Built around Yamaha's minibike, cross motorcycle platform, the 2018 Yamaha PW50 relies on a 49 cc (3 cu in) air-cooled single cylinder, two-stroke powerplant. Internal engine geometry specifies a bore and stroke of 40.0 x 39.2 mm (1.6 x 1.5 inches) with a 6.0:1 compression ratio.
On the scales, the PW50 measures 39 kg (86 lbs) wet (curb). Rider ergonomics and chassis geometry center around a 485 mm (19.1 in) seat height — giving shorter riders and urban commuters confident flat-foot reach at traffic stops, combined with a 856 mm (33.7 in) wheelbase engineered for quick, flickable steering geometry. The 2.01-liter (0.5 US gal) fuel tank supports practical everyday commuting and weekend road stints.
Within MotoLibrary's Yamaha archive, this model family spans 18 indexed model years from 2008 to 2025, allowing buyers to track year-over-year changes in emissions tuning, weight and equipment.
Standover Height
485 mm (19.1 in)
Engine
Displacement49.0 ccm (2.99 cubic inches)
Engine TypeSingle cylinder, two-stroke
Engine DetailsReed-valve inducted
Compression6.0:1
Bore x Stroke40.0 x 39.2 mm (1.6 x 1.5 inches)
Fuel SystemCarburettor. Mikuni VM12/1
IgnitionCDI
LubricationAutolube oil injection system
CoolingAir
Transmission
GearboxAutomatic
Final DriveShaft drive (cardan) (final drive)
ClutchWet centrifugal automatic clutch
Chassis
Frame TypeSteel tube backbone
Rake25.5°
Trail51 mm (2.0 inches)
Front SuspensionTelescopic fork
Front Travel61 mm (2.4 inches)
Rear SuspensionUnit swingarm
Rear Travel51 mm (2.0 inches)
Wheelbase856 mm (33.7 inches)
Ground Clearance104 mm (4.1 inches)
Wheels & Brakes
Front Tyre2.50-10
Rear Tyre2.50-10
Front BrakesExpanding brake (drum brake)
Rear BrakesExpanding brake (drum brake)
Dimensions & Weight
Weight incl.39.0 kg (86.0 pounds)
Seat Height485 mm (19.1 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.
Transmission
Transmission and final drive affect maintenance, smoothness and everyday usability.
