Yamaha Majesty S 155 / SMAX 155 (SG28J / SG52J) — OEM Fluid, Tire Pressure & Maintenance Specs
155cc Liquid-Cooled Single SOHC 4-Valve FI (Horizontal Monoshock) · Source: Yamaha Majesty S 155 / SMAX 155 (SG28J / SG52J) (2013–2020) Official Owner’s Manual Maintenance Specifications
According to the Yamaha Majesty S 155 / SMAX 155 (SG28J / SG52J) (2013–2020) Official Owner’s Manual Maintenance Specifications, the 2013–2020 Yamaha Majesty S 155 / SMAX 155 (SG28J / SG52J) (chassis SG28J/SG52J/2LD) requires 0.95 L (1.00 US qt) of SAE 10W-40 (JASO 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 (Oil Strainer Screen)). Standard solo cold tire pressure is 200 kPa / 2.00 bar / 29 PSI front (120/70-13M/C 53P) and 225 kPa / 2.25 bar / 33 PSI rear (130/70-13M/C 63P), paired with 1× NGK CR7E spark plug(s) and a YT7B-BS battery.
Drain only: 0.95 L (1.00 US qt)
R 225 kPa (2.25 bar)
Est. Range: ~259 km (161 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 MB · API SG or higher |
| Oil Volume (Drain / With Filter / Overhaul) |
• Drain only: 0.95 L (1.00 US qt) • With filter/strainer: 0.95 L (1.00 US qt) • Complete dry overhaul: 1.1 L (1.16 US qt) |
| OEM Oil Filter Code & Type | B65-E3411-00 (Oil Strainer Screen) |
| 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 / Bevel Gear Oil | 140 ml (0.14 L) — SAE 10W-30 / 10W-40 (140 ml rear gear oil) |
2. Cold Tire Pressures, Wheels, Ignition & Drivetrain
| Front / Rear OEM Tire Sizes | Front: 120/70-13M/C 53P · Rear: 130/70-13M/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: 225 kPa / 2.25 bar / 33 PSI |
| OEM Spark Plug & Quantity | NGK CR7E × 1 (Gap: 0.8–0.9 mm) |
| OEM Battery Code & Rating | YT7B-BS (12V 6.5Ah MF AGM) |
| Final Drive Maintenance | Dry V-Belt CVT Drive — Inspect/replace V-belt and rollers every 20,000–24,000 km |
| Brake Fluid & Coolant | DOT 4 · Silicate-free ethylene-glycol OAT coolant for aluminum radiators (50:50 premix) |
3. Ergonomics, Range & Scheduled Service Intervals
| Displacement · Max Power · Peak Torque | 155 cc · 15 hp @ 7,500 rpm · 14 N·m (10.3 lb-ft) @ 6,000 rpm |
|---|---|
| Seat Height & Wet Curb Weight | 795 mm (31.3 in) · 145 kg (320 lbs) |
| Fuel Tank & Est. Real-World Range | 7.4 L (2.0 US gal) · ~35 km/L → ~259 km (161 mi) |
| OEM Scheduled Maintenance Intervals |
• First Break-In: 1,000 km • Engine Oil / Filter: 4,000 km / 8,000 km • Air Filter / Spark Plug: 12,000 km / 8,000 km • Valve Clearance Check: 12,000 km |
4. Generation Cutoffs & Real-World Wrenching Gotchas
Model-Year & Chassis Generation Notes
Built by Yamaha Taiwan with a flat floorboard and mid-ship horizontal monoshock, the SG28J Majesty S/SMAX gained LED headlights on the 2018–2020 SG52J facelift.
Oil & Clutch Mechanical Engineering Note
This pre-VVA 155cc liquid-cooled 4-valve dry-CVT engine takes 0.95 L of SAE 10W-40 JASO MB oil (clean the lower mesh strainer) and 140 ml of final gear oil.