Built around Yamaha's scooter motorcycle platform, the 2022 Yamaha NMAX 155 relies on a 155 cc (9.5 cu in) liquid-cooled single cylinder, four-stroke powerplant. In factory specification, peak output is rated at 12.1 HP (8.8 kW) at 7,500 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 78.1 HP per liter and a 1,500 rpm working window between peak torque (6,000 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 NMAX 155 measures 127 kg (280 lbs) wet (curb), translating to a power-to-weight ratio of 0.1 HP/kg (10.5 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 7.1-liter (1.9 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
78.1 HP/L
Power-to-Weight
0.1 HP/kg (10.5 kg/HP)
Power Band Window
6,000–7,500 rpm
Standover Height
765 mm (30.1 in)
Engine
Displacement155.0 ccm (9.46 cubic inches)
Engine TypeSingle cylinder, four-stroke
Power12.1 HP (8.8 kW)) @ 7500 RPM
Torque14.4 Nm (1.5 kgf-m or 10.6 ft.lbs) @ 6000 RPM
Compression11.6:1
Bore x Stroke58.0 x 58.7 mm (2.3 x 2.3 inches)
Valves/Cylinder4
Fuel SystemInjection
Fuel ControlSingle Overhead Cams (SOHC)
IgnitionTCI
LubricationWet sump
CoolingLiquid
Transmission
GearboxAutomatic
Final DriveBelt (final drive)
ClutchDry centrifugal
DrivelineV-Belt Automatic
Performance
Emission DetailsEuro 5
Chassis
Frame TypeUnderbone
Rake26.0°
Trail92 mm (3.6 inches)
Front SuspensionTelescopic fork
Front Travel100 mm (3.9 inches)
Rear SuspensionUnit Swing, twin shocks
Rear Travel85 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.
