Yamaha BWS 125 / Zuma 125 (SEA6J Air-Cooled) — OEM Fluid, Tire Pressure & Maintenance Specs
124cc Forced Air-Cooled Single SOHC 4-Valve FI Dual-Sport Scooter · Source: Yamaha BWS 125 / Zuma 125 (SEA6J Air-Cooled) (2009–2020) Official Owner’s Manual Maintenance Specifications
According to the Yamaha BWS 125 / Zuma 125 (SEA6J Air-Cooled) (2009–2020) Official Owner’s Manual Maintenance Specifications, the 2009–2020 Yamaha BWS 125 / Zuma 125 (SEA6J Air-Cooled) (chassis SEA6J/BG1/5S9) requires 0.9 L (0.95 US qt) of SAE 10W-40 (JASO MB, API SG or higher) engine oil for a drain-only change and 0.9 L (0.95 US qt) with filter service (B65-E3411-00 (Oil Strainer Screen)). Standard solo cold tire pressure is 175 kPa / 1.75 bar / 25 PSI front (120/70-12 51L) and 200 kPa / 2.00 bar / 29 PSI rear (130/70-12 56L), paired with 1× NGK CR7E spark plug(s) and a YTZ7V / YTZ6V battery.
Drain only: 0.9 L (0.95 US qt)
R 200 kPa (2.00 bar)
Est. Range: ~237 km (147 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: 0.9 L (0.95 US qt) • With filter/strainer: 0.9 L (0.95 US qt) • Complete dry overhaul: 1 L (1.06 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 | 110 ml (0.11 L) — SAE 10W-40 / 85W-140 (110 ml rear gear oil) |
2. Cold Tire Pressures, Wheels, Ignition & Drivetrain
| Front / Rear OEM Tire Sizes | Front: 120/70-12 51L · Rear: 130/70-12 56L (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 CR7E × 1 (Gap: 0.8–0.9 mm) |
| OEM Battery Code & Rating | YTZ7V / YTZ6V (12V 6.0Ah 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 · Forced Air-Cooled Engine (No liquid coolant) |
3. Ergonomics, Range & Scheduled Service Intervals
| Displacement · Max Power · Peak Torque | 124 cc · 9.8 hp @ 7,500 rpm · 9.9 N·m (7.3 lb-ft) @ 6,000 rpm |
|---|---|
| Seat Height & Wet Curb Weight | 780 mm (30.7 in) · 120 kg (265 lbs) |
| Fuel Tank & Est. Real-World Range | 6.5 L (1.7 US gal) · ~36.5 km/L → ~237 km (147 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
Produced across 2009–2015 Gen 1 (5S9, rear drum) and 2016–2020 Gen 2 (SEA6J/BG1, rear disc and asymmetric lights), both ran the air-cooled Cygnus-X 4-valve engine.
Oil & Clutch Mechanical Engineering Note
Unlike the 2021+ liquid-cooled BWS, this forced-air-cooled 4-valve dry-CVT engine has no radiator and takes 0.9 L of SAE 10W-40 JASO MB oil plus 110 ml gear oil.