Yamaha NMAX 155 (GPD155-A) — OEM Fluid, Tire Pressure & Maintenance Specs
155cc Liquid-Cooled Single-Cylinder SOHC 4-Valve VVA Blue Core (Dry CVT) · Source: Yamaha NMAX 155 (GPD155-A / SG65) Official Owner’s Manual Specifications
According to the Yamaha NMAX 155 (GPD155-A / SG65) Official Owner’s Manual Specifications, the 2020–Present Yamaha NMAX 155 (GPD155-A) (chassis SG65/GPD155-A/B6H) requires 0.9 L (0.95 US qt) of SAE 10W-40 (JASO MA OR MB, API SG or higher) engine oil for a drain-only change and 0.95 L (1.00 US qt) with filter service (B65-E3411-00 (Mesh Strainer)). Standard solo cold tire pressure is 200 kPa / 2.00 bar / 29 PSI front (110/70-13 M/C 48P) and 225 kPa / 2.25 bar / 33 PSI rear (130/70-13 M/C 63P), paired with 1× NGK CPR8EA-9 spark plug(s) and a YTZ7V battery.
Drain only: 0.9 L (0.95 US qt)
R 225 kPa (2.25 bar)
Est. Range: ~284 km (176 mi)
1. Engine Lubrication, Filter & Clutch Specifications
| Clutch Architecture | Dry Centrifugal CVT Belt Drive |
|---|---|
| Recommended Viscosity & Grade | SAE 10W-40 (Alt: SAE 10W-30) · JASO MA OR MB · API SG or higher |
| Oil Volume (Drain / With Filter / Overhaul) |
• Drain only: 0.9 L (0.95 US qt) • With filter/strainer: 0.95 L (1.00 US qt) • Complete dry overhaul: 1 L (1.06 US qt) |
| OEM Oil Filter Code & Type | B65-E3411-00 (Mesh Strainer) |
| Correct Oil Level Check Method | Hold upright on level ground; rest dipstick UNTHREADED on filler neck (do NOT screw in) |
| Oil Drain Bolt Torque | 20 N·m (14.8 lb-ft / 2.04 kgf·m) — Use fresh crush washer |
| Final Drive / Gear Oil | 100 ml (0.10 L) — SAE 10W-40 Motor Oil or SAE 85W GL-3 Gear Oil (100 ml) |
2. Cold Tire Pressures, Wheels, Ignition & Drivetrain
| Front / Rear OEM Tire Sizes | Front: 110/70-13 M/C 48P · Rear: 130/70-13 M/C 63P (Tubeless) |
|---|---|
| Cold Tire Pressure — Solo Riding |
Front: 200 kPa / 2.00 bar / 29 PSI Rear: 225 kPa / 2.25 bar / 33 PSI |
| Cold Tire Pressure — 2-Up / Loaded Touring |
Front: 200 kPa / 2.00 bar / 29 PSI Rear: 250 kPa / 2.50 bar / 36 PSI |
| OEM Spark Plug & Quantity | NGK CPR8EA-9 × 1 (Gap: 0.8–0.9 mm) |
| OEM Battery Code & Rating | YTZ7V (12V 6.0Ah VRLA AGM) |
| Final Drive Maintenance | Yamaha OEM V-Belt (B65-E7641-00) — Replace every 20,000 km |
| Brake Fluid & Coolant | DOT 4 · Yamalube Ethylene Glycol Coolant (~0.46 L) |
3. Ergonomics, Range & Scheduled Service Intervals
| Displacement · Max Power · Peak Torque | 155 cc · 15.1 hp @ 8,000 rpm · 13.9 N·m (10.3 lb-ft) @ 6,500 rpm |
|---|---|
| Seat Height & Wet Curb Weight | 765 mm (30.1 in) · 132 kg (291 lbs) |
| Fuel Tank & Est. Real-World Range | 7.1 L (1.9 US gal) · ~40 km/L → ~284 km (176 mi) |
| OEM Scheduled Maintenance Intervals |
• First Break-In: 1,000 km • Engine Oil / Filter: 6,000 km / 12,000 km • Air Filter / Spark Plug: 12,000 km / 12,000 km • Valve Clearance Check: 12,000 km |
4. Generation Cutoffs & Real-World Wrenching Gotchas
Model-Year & Chassis Generation Notes
Gen 2 (2020+ SG65/B6H) NMAX 155 models take 0.90 L engine oil (1.00 L overhaul) and reduced final-drive gear oil capacity from 150 ml down to 100 ml (0.10L stamped on the gearcase).
Oil & Clutch Mechanical Engineering Note
Because the 155cc Blue Core engine works harder at highway speeds in a compact 131 kg chassis, a full-synthetic SAE 10W-40 JASO MB oil resists thermal shear best.
Garage Wrenching Gotchas
- Do not squeeze an entire 120–150 ml scooter gear-oil tube into a Gen 2 NMAX 155; measure exactly 100 ml with a syringe so excess oil cannot vent onto the rear tire.
- Models equipped with the Y-Connect Bluetooth CCU module draw higher parasitic current when parked; use a smart tender if leaving the scooter unused for over two weeks.
5. Frequently Asked Questions (FAQ)
Does the Yamaha NMAX 155 take 0.9 L or 1.0 L of engine oil?
Standard Gen 2 periodic drain-and-fill is 0.90 L (1.00 L total dry capacity), though select regional variants with the enlarged sump stamp 1000 cm³ beside the dipstick—always match your crankcase stamp.
What is the correct cold tire pressure for the NMAX 155?
Set 200 kPa (29 PSI) front and 225 kPa (33 PSI) rear for solo riding, or 250 kPa (36 PSI) rear with a passenger.
Does the NMAX 155 require a motorcycle license above the 125cc tier?
At 155cc, it exceeds 125cc learner/A1 limits—requiring a Class 2 Small Motorcycle license in Korea and an A2/full motorcycle license in Europe.