Engineered by Yamaha for the scooter motorcycle segment, the 2017 Yamaha Neos 4 utilizes a 49.4 cc (3 cu in) liquid-cooled single cylinder, four-stroke layout. In factory specification, peak output is rated at 3.1 HP (2.2 kW) at 7,000 rpm while maximum torque reaches 3.2 Nm (2.3 lb-ft) at 7,000 rpm, transferring power to the rear wheel through a automatic gearbox and belt final drive. Internal engine geometry specifies a bore and stroke of 38.0 x 43.6 mm (1.5 x 1.7 inches) with a 12.0:1 compression ratio.
On the scales, the Neos 4 measures 95 kg (209 lbs) wet (curb). Rider ergonomics and chassis geometry center around a 790 mm (31.1 in) seat height — offering a neutral standover height that accommodates most average-inseam riders without sacrificing cornering clearance, combined with a 1,275 mm (50.2 in) wheelbase engineered for quick, flickable steering geometry. The 5.4-liter (1.4 US gal) fuel tank supports practical everyday commuting and weekend road stints.
Within MotoLibrary's Yamaha archive, this model family spans 6 indexed model years from 2014 to 2022, allowing buyers to track year-over-year changes in emissions tuning, weight and equipment.
Standover Height
790 mm (31.1 in)
Engine
Displacement49.4 ccm (3.01 cubic inches)
Engine TypeSingle cylinder, four-stroke
Engine DetailsSingle cylinder, four-stroke
Power3.1 HP (2.2 kW)) @ 7000 RPM
Torque3.2 Nm (0.3 kgf-m or 2.3 ft.lbs) @ 7000 RPM
Compression12.0:1
Bore x Stroke38.0 x 43.6 mm (1.5 x 1.7 inches)
Fuel SystemInjection
Fuel ControlSingle Overhead Cams (SOHC)
IgnitionTCI
LubricationWet sump
CoolingLiquid
Transmission
GearboxAutomatic
Final DriveBelt (final drive)
Chassis
Front SuspensionTelescopic fork
Front Travel70 mm (2.8 inches)
Rear SuspensionHydraulic unit swing
Rear Travel60 mm (2.4 inches)
Wheelbase1275 mm (50.2 inches)
Ground Clearance154 mm (6.1 inches)
Wheels & Brakes
Front Tyre120/70-12
Rear Tyre130/70-12
Front BrakesSingle disc
Front Brake Ø190 mm (7.5 inches)
Rear BrakesExpanding brake (drum brake)
Rear Brake Ø110 mm (4.3 inches)
WheelsAalloy wheels
Dimensions & Weight
Weight incl.95.0 kg (209.4 pounds)
Seat Height790 mm (31.1 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.
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.
