At the heart of the 2019 Yamaha NMAX 155 scooter motorcycle, Yamaha utilizes a 155 cc (9.5 cu in) liquid-cooled single cylinder, four-stroke layout. In factory specification, peak output is rated at 14.9 HP (10.9 kW) at 8,000 rpm while maximum torque reaches 14.4 Nm (10.6 lb-ft) at 6,000 rpm, transferring power to the rear wheel through a automatic gearbox and belt final drive. With a specific output of 96.1 HP per liter and a 2,000 rpm working window between peak torque (6,000 rpm) and peak power (8,000 rpm), the engine character is reflecting a performance-oriented street tune that balances strong mid-range pull with an energetic top-end rush.
On the scales, the NMAX 155 measures 127 kg (280 lbs) wet (curb), translating to a power-to-weight ratio of 0.12 HP/kg (8.52 kg per horsepower). 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 1,350 mm (53.1 in) wheelbase engineered for quick, flickable steering geometry. The 6.6-liter (1.7 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 2018 to 2025, allowing buyers to track year-over-year changes in emissions tuning, weight and equipment.
Specific Output
96.1 HP/L
Power-to-Weight
0.12 HP/kg (8.52 kg/HP)
Power Band Window
6,000–8,000 rpm
Standover Height
765 mm (30.1 in)
Engine
Displacement155.0 ccm (9.46 cubic inches)
Engine TypeSingle cylinder, four-stroke
Power14.9 HP (10.9 kW)) @ 8000 RPM
Torque14.4 Nm (1.5 kgf-m or 10.6 ft.lbs) @ 6000 RPM
Compression10.5:1
Bore x Stroke58.0 x 58.7 mm (2.3 x 2.3 inches)
Valves/Cylinder4
Fuel SystemInjection
Fuel ControlSingle Overhead Cams (SOHC)
IgnitionTransistorised
LubricationWet sump
CoolingLiquid
Transmission
GearboxAutomatic
Final DriveBelt (final drive)
ClutchDry centrifugal
DrivelineV-Belt Automatic
Chassis
Frame TypeBackbone
Rake26.0°
Trail92 mm (3.6 inches)
Front SuspensionTelescopic fork
Front Travel110 mm (4.3 inches)
Rear SuspensionUnit Swing, monoshock
Rear Travel84 mm (3.3 inches)
Wheelbase1350 mm (53.1 inches)
Ground Clearance135 mm (5.3 inches)
Wheels & Brakes
Front Tyre110/70-13
Rear Tyre130/70-13
Front BrakesSingle disc. Hydraulic. ABS.
Front Brake Ø230 mm (9.1 inches)
Rear BrakesSingle disc. ABS.
Rear Brake Ø230 mm (9.1 inches)
Dimensions & Weight
Weight incl.127.0 kg (280.0 pounds)
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.
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.
