Built around Yamaha's scooter motorcycle platform, the 2007 Yamaha Why relies on a 49 cc (3 cu in) air-cooled single cylinder, two-stroke powerplant. In factory specification, peak output is rated at 3.2 HP (2.3 kW) at 6,500 rpm while maximum torque reaches 3.5 Nm (2.6 lb-ft) at 6,250 rpm, transferring power to the rear wheel through a automatic gearbox and belt final drive. Internal engine geometry specifies a bore and stroke of 40.0 x 39.2 mm (1.6 x 1.5 inches) with a 7.3:1 compression ratio.
On the scales, the Why measures 73 kg (161 lbs) dry. Rider ergonomics and chassis geometry center around a 765 mm (30.1 in) seat height — giving shorter riders and urban commuters confident flat-foot reach at traffic stops, combined with a 1,294 mm (50.9 in) wheelbase engineered for quick, flickable steering geometry. The 7-liter (1.8 US gal) fuel tank supports practical everyday commuting and weekend road stints.
Within MotoLibrary's Yamaha archive, this model family spans 5 indexed model years from 2006 to 2010, allowing buyers to track year-over-year changes in emissions tuning, weight and equipment.
Power Band Window
6,250–6,500 rpm
Standover Height
765 mm (30.1 in)
Engine
Displacement49.0 ccm (2.99 cubic inches)
Engine TypeSingle cylinder, two-stroke
Engine DetailsSingle cylinder, two-stroke
Power3.2 HP (2.3 kW)) @ 6500 RPM
Torque3.5 Nm (0.4 kgf-m or 2.6 ft.lbs) @ 6250 RPM
Compression7.3:1
Bore x Stroke40.0 x 39.2 mm (1.6 x 1.5 inches)
Fuel SystemCarburettor. Gurtner PY-12
IgnitionCDI
LubricationSeperate lubrification
CoolingAir
Transmission
GearboxAutomatic
Final DriveBelt (final drive)
Chassis
Front SuspensionHydraulic and telescopic fork
Rear SuspensionHydraulic and telescopic fork
Wheelbase1294 mm (50.9 inches)
Ground Clearance125 mm (4.9 inches)
Wheels & Brakes
Front Tyre70/90-16
Rear Tyre80/90-16
Front BrakesSingle disc
Front Brake Ø220 mm (8.7 inches)
Rear BrakesExpanding brake (drum brake)
Rear Brake Ø110 mm (4.3 inches)
Dimensions & Weight
Dry Weight73.0 kg (160.9 pounds)
Power/Weight0.0440 HP/kg
Seat Height765 mm (30.1 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.
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.
Weight
Compare weight carefully because it affects low-speed handling, parking and confidence.
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.
