Yamaha YS125 (RE33 Commuter) — OEM Fluid, Tire Pressure & Maintenance Specs
125cc Air-Cooled Single SOHC 2-Valve FI Long-Stroke 5-Speed · Source: Yamaha YS125 (RE33 Commuter) (2017–2021) Official Owner’s Manual Maintenance Specifications
According to the Yamaha YS125 (RE33 Commuter) (2017–2021) Official Owner’s Manual Maintenance Specifications, the 2017–2021 Yamaha YS125 (RE33 Commuter) (chassis RE33/BR6) requires 1 L (1.06 US qt) of SAE 10W-40 (JASO MA2, API SG or higher) engine oil for a drain-only change and 1 L (1.06 US qt) with filter service (5VL-E3411-00 (Oil Strainer Screen)). Standard solo cold tire pressure is 175 kPa / 1.75 bar / 25 PSI front (2.75-18M/C 42P) and 200 kPa / 2.00 bar / 29 PSI rear (100/80-18M/C 59P), paired with 1× NGK CPR7EA-9 spark plug(s) and a YTZ6V / YTX7L-BS battery.
Drain only: 1 L (1.06 US qt)
R 200 kPa (2.00 bar)
Est. Range: ~672 km (418 mi)
1. Engine Lubrication, Filter & Clutch Specifications
| Clutch Architecture | Wet Multi-Plate Manual Clutch NEVER use JASO MB |
|---|---|
| Recommended Viscosity & Grade | SAE 10W-40 · JASO MA2 · API SG or higher |
| Oil Volume (Drain / With Filter / Overhaul) |
• Drain only: 1 L (1.06 US qt) • With filter/strainer: 1 L (1.06 US qt) • Complete dry overhaul: 1.2 L (1.27 US qt) |
| OEM Oil Filter Code & Type | 5VL-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 |
2. Cold Tire Pressures, Wheels, Ignition & Drivetrain
| Front / Rear OEM Tire Sizes | Front: 2.75-18M/C 42P · Rear: 100/80-18M/C 59P (Tubeless) |
|---|---|
| Cold Tire Pressure — Solo Riding |
Front: 175 kPa / 1.75 bar / 25 PSI Rear: 200 kPa / 2.00 bar / 29 PSI |
| Cold Tire Pressure — 2-Up / Loaded Touring |
Front: 175 kPa / 1.75 bar / 25 PSI Rear: 225 kPa / 2.25 bar / 33 PSI |
| OEM Spark Plug & Quantity | NGK CPR7EA-9 × 1 (Gap: 0.8–0.9 mm) |
| OEM Battery Code & Rating | YTZ6V / YTX7L-BS (12V 5.0–6.0Ah MF AGM) |
| Final Drive Maintenance | 428 Drive Chain — Maintain 20–30 mm slack and lubricate regularly |
| Brake Fluid & Coolant | DOT 4 · Air-Cooled Single Engine (No liquid coolant) |
3. Ergonomics, Range & Scheduled Service Intervals
| Displacement · Max Power · Peak Torque | 125 cc · 10.6 hp @ 7,500 rpm · 10.8 N·m (8.0 lb-ft) @ 6,000 rpm |
|---|---|
| Seat Height & Wet Curb Weight | 795 mm (31.3 in) · 129 kg (284 lbs) |
| Fuel Tank & Est. Real-World Range | 14 L (3.7 US gal) · ~48 km/L → ~672 km (418 mi) |
| OEM Scheduled Maintenance Intervals |
• First Break-In: 1,000 km • Engine Oil / Filter: 3,000 km / 6,000 km • Air Filter / Spark Plug: 12,000 km / 9,000 km • Valve Clearance Check: 12,000 km |
4. Generation Cutoffs & Real-World Wrenching Gotchas
Model-Year & Chassis Generation Notes
Succeeding the YBR125 for Euro 4 in 2017 (RE33), the YS125 introduced a new long-stroke (52.4 x 57.9 mm) air-cooled engine, UBS linked brakes, and a 14.0 L tank.
Oil & Clutch Mechanical Engineering Note
Using a cleanable internal strainer screen with no paper element, drain and refill 1.0 L of SAE 10W-40 JASO MA2 oil every 3,000–4,000 km.