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Yamaha NMAX 155(2024–present)

Official service intervals, fluid capacities, and torque specifications for the Yamaha NMAX 155. Source citation: Yamaha Motor Co. NMAX 155 (GPD150) Official Service Manual.

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Quick Reference Specifications

Essential technical numbers for regular maintenance and routine oil changes

Dual Metric / Imperial

Engine Oil Type: 10W-40 Yamalube 4-AT (API SG / JASO MB)
Oil Capacity: 0.9 L (0.95 US qt) at draining / 1.0 L (1.06 US qt) at overhaul
Drain Bolt Torque: 20 N·m (15 lbf·ft)
Spark Plug: NGK CPR8EA-9
Spark Plug Gap: 0.8–0.9 mm (0.031–0.035 in)
Service Interval: 4,000 km (2500 mi) / 6 mo
Cold Tire Pressures (Front / Rear): Front: 200 kPa (29 psi)Rear: 225 kPa (33 psi) solo / 250 kPa (36 psi) with passenger

Periodic Maintenance Schedule

Recommended factory inspection and replacement intervals under normal riding conditions

Service Item	Action	Distance Interval	Time Interval	Notes / Source
Initial Break-in Service (Oil & Strainer)Break-in	replace	1,000 km(600 mi)	1 mo	Mandatory initial break-in service at 1,000 km
Engine Oil	replace	4,000 km(2,500 mi)	6 mo	Use Yamalube 4-AT JASO MB oil
Oil Strainer Screen	clean	12,000 km(8,000 mi)	18 mo	Clean mesh strainer in solvent
Final Transmission Gear Oil	replace	12,000 km(8,000 mi)	12 mo	150 ml Yamalube 10W-40
Spark Plug	inspect	4,000 km(2,500 mi)	6 mo	Factory manual requirement
Spark Plug	replace	8,000 km(5,000 mi)	12 mo	NGK CPR8EA-9
V-Belt Drive	inspect	8,000 km(5,000 mi)	—	Check width against 23.5 mm wear limit
V-Belt Drive	replace	25,000 km(15,500 mi)	—	Factory replacement interval
Air Cleaner Element	replace	12,000 km(8,000 mi)	—	Factory manual requirement
Valve Clearance	inspect	12,000 km(8,000 mi)	—	Inspect cold: In 0.10–0.14 mm / Ex 0.21–0.25 mm
Brake Fluid (DOT 4)	replace	—	24 mo	Replace every 2 years
Coolant	replace	36,000 km(22,500 mi)	36 mo	Factory manual requirement

Technical Specifications & Torque Values

Factory torque limits, fluid viscosities and adjustment clearances

Fluids & LubricantsViscosity & Capacities

Engine Oil ViscosityYamalube 10W-40 4-AT (JASO MB)

Engine Oil Capacity (Drain)0.9 L

Engine Oil Capacity (Overhaul)1.0 L

Final Transmission Oil150 ml (Yamalube 10W-40)

Coolant Capacity0.49 L (radiator) + 0.15 L (reservoir)

Fastener TorquesN·m (ft-lb)

Engine Oil Drain Bolt Torque20 N·m(15 lbf·ft)

Spark Plug Torque13 N·m(9.6 lbf·ft)

Engine & IgnitionClearances & Gaps

Spark PlugNGK CPR8EA-9

Valve Clearance (Intake)0.10–0.14 mm

Valve Clearance (Exhaust)0.21–0.25 mm

Chassis & TiresPressures & Sizing

V-Belt Wear Limit23.5 mm (nominal 24.5 mm)

Front Tire Pressure200 kPa (2.00 bar)

Rear Tire Pressure225 kPa solo / 250 kPa pillion

Front Tire Size110/70-13 M/C 48P

Rear Tire Size130/70-13 M/C 63P

Source & Provenance: Yamaha Motor Co. NMAX 155 (GPD150) Official Service Manual

Status: high confidence (checked 2026-10)

Titlemark maintains strict citations for all technical figures. Where factory service manuals are pending audit, conservative baseline service intervals are displayed and bolt torques are explicitly marked as "Not specified in source" to prevent overtightening.

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