Built around Yamaha's scooter motorcycle platform, the 2017 Yamaha Alpha pairs a 113 cc (6.9 cu in) liquid-cooled single cylinder, four-stroke architecture with road-focused gearing. In factory specification, maximum torque reaches 8.1 Nm (6 lb-ft), transferring power to the rear wheel through a automatic gearbox and belt final drive. Internal engine geometry specifies a bore and stroke of 50.0 x 57.8 mm (2.0 x 2.3 inches) with a 9.2:1 compression ratio.
Rider ergonomics and chassis geometry center around a 775 mm (30.5 in) seat height — offering a neutral standover height that accommodates most average-inseam riders without sacrificing cornering clearance, combined with a 1,270 mm (50 in) wheelbase engineered for quick, flickable steering geometry. The 5.2-liter (1.4 US gal) fuel tank supports practical everyday commuting and weekend road stints.
Standover Height
775 mm (30.5 in)
Engine
Displacement113.0 ccm (6.90 cubic inches)
Engine TypeSingle cylinder, four-stroke
Engine DetailsSingle cylinder, four-stroke
Torque8.1 Nm (0.8 kgf-m or 6.0 ft.lbs)
Compression9.2:1
Bore x Stroke50.0 x 57.8 mm (2.0 x 2.3 inches)
Fuel SystemCarburettor
Fuel ControlSingle Overhead Cams (SOHC)
IgnitionC.D.I.(Capacitor Discharge lgnition)
LubricationWet Sump
CoolingLiquid
Transmission
GearboxAutomatic
Final DriveBelt (final drive)
ClutchDry, Centrifugal, Shoe
Chassis
Frame TypeUnderbone
Front SuspensionTelescopic fork
Rear SuspensionUnit Swing
Wheelbase1270 mm (50.0 inches)
Wheels & Brakes
Front Tyre90/100-10
Rear Tyre90/100-10
Front BrakesSingle disc. Optinal drum brake
Rear BrakesExpanding brake (drum brake)
Dimensions & Weight
Seat Height775 mm (30.5 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.
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.
