At the heart of the 2018 Yamaha Cygnus Alpha scooter motorcycle, Yamaha relies on a 113 cc (6.9 cu in) air-cooled single cylinder, four-stroke powerplant. In factory specification, peak output is rated at 7.2 HP (5.3 kW) at 7,500 rpm while maximum torque reaches 8.1 Nm (6 lb-ft) at 5,000 rpm, transferring power to the rear wheel through a automatic gearbox and belt final drive. With a specific output of 63.7 HP per liter and a 2,500 rpm working window between peak torque (5,000 rpm) and peak power (7,500 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 Cygnus Alpha measures 102 kg (225 lbs) wet (curb), translating to a power-to-weight ratio of 0.07 HP/kg (14.17 kg per horsepower). 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.
Specific Output
63.7 HP/L
Power-to-Weight
0.07 HP/kg (14.17 kg/HP)
Power Band Window
5,000–7,500 rpm
Standover Height
775 mm (30.5 in)
Engine
Displacement113.0 ccm (6.90 cubic inches)
Engine TypeSingle cylinder, four-stroke
Power7.2 HP (5.3 kW)) @ 7500 RPM
Torque8.1 Nm (0.8 kgf-m or 6.0 ft.lbs) @ 5000 RPM
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
CoolingAir
Transmission
GearboxAutomatic
Final DriveBelt (final drive)
ClutchDry, Centrifugal, Shoe
DrivelineV-Belt Automatic
Chassis
Frame TypeUnderbone
Front SuspensionTelescopic fork
Rear SuspensionUnit swing
Wheelbase1270 mm (50.0 inches)
Ground Clearance130 mm (5.1 inches)
Wheels & Brakes
Front Tyre90/100-10
Rear Tyre90/100-10
Front BrakesSingle disc. Optional drum
Rear BrakesSingle disc. Optional drum
Dimensions & Weight
Weight incl.102.0 kg (224.9 pounds)
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.
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.
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.
