Built around Honda's touring motorcycle platform, the 2018 Honda NM4 pairs a 670 cc (40.9 cu in) liquid-cooled twin, four-stroke architecture with road-focused gearing. Internal engine geometry specifies a bore and stroke of 73.0 x 80.0 mm (2.9 x 3.1 inches) with a 10.7:1 compression ratio.
On the scales, the NM4 measures 254.9 kg (562 lbs) wet (curb). Rider ergonomics and chassis geometry center around a 650 mm (25.6 in) seat height — giving shorter riders and urban commuters confident flat-foot reach at traffic stops, combined with a 1,646 mm (64.8 in) wheelbase engineered for planted straight-line stability. The 14-liter (3.7 US gal) fuel tank paired with a rated consumption of 3.68 L/100 km provides an estimated theoretical range of roughly 380 km (236 miles) between fill-ups.
Within MotoLibrary's Honda archive, this model family spans 4 indexed model years from 2015 to 2019, allowing buyers to track year-over-year changes in emissions tuning, weight and equipment.
Theoretical Range
~380 km (236 mi)
Engine
Displacement670.0 ccm (40.88 cubic inches)
Engine TypeTwin, four-stroke
Compression10.7:1
Bore x Stroke73.0 x 80.0 mm (2.9 x 3.1 inches)
Valves/Cylinder4
Fuel SystemInjection. PGM-FI, 36mm throttle body
Fuel ControlSingle Overhead Cams (SOHC)
IgnitionDigital transistorized with electronic advance
CoolingLiquid
Transmission
GearboxAutomatic
Final DriveChain (final drive)
ClutchAutomatic six-speed with two automatic modes and a manual mode
Performance
Fuel Consumption3.68 litres/100 km (27.2 km/l or 63.92 mpg)
Greenhouse Gases85.4 CO2 g/km. (CO2 - Carbon dioxide emission)
Emission DetailsMeets current EPA standards. Models sold in California meet current CARB standards and may differ slightly due to emissions equipment.
Chassis
Rake27.0°
Trail110 mm (4.3 inches)
Front Suspension41mm fork
Front Travel99 mm (3.9 inches)
Rear SuspensionPro-Link® single shock
Rear Travel99 mm (3.9 inches)
Wheelbase1646 mm (64.8 inches)
Wheels & Brakes
Front Tyre120/70-ZR18
Rear Tyre200/50-ZR17
Front BrakesSingle disc. ABS. Two-piston calipers.
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.
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.
