Yamaha WR155R (B3M VVA Dual-Sport) — OEM Fluid, Tire Pressure & Maintenance Specs
155cc Liquid-Cooled Single SOHC 4-Valve VVA (Semi-Double Cradle) · Source: Yamaha WR155R (B3M VVA Dual-Sport) (2020–Present) Official Owner’s Manual Maintenance Specifications
According to the Yamaha WR155R (B3M VVA Dual-Sport) (2020–Present) Official Owner’s Manual Maintenance Specifications, the 2020–Present Yamaha WR155R (B3M VVA Dual-Sport) (chassis B3M/DG37) requires 0.85 L (0.90 US qt) of SAE 10W-40 (JASO MA2, API SG or higher) engine oil for a drain-only change and 0.95 L (1.00 US qt) with filter service (1S7-E3440-00 / HF141). Standard solo cold tire pressure is 150 kPa / 1.50 bar / 22 PSI front (2.75-21 45P) and 175 kPa / 1.75 bar / 25 PSI rear (4.10-18 59P), paired with 1× NGK MR8E-9 spark plug(s) and a YTZ6V / YTX7L-BS battery.
Drain only: 0.85 L (0.90 US qt)
R 175 kPa (1.75 bar)
Est. Range: ~324 km (201 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: 0.85 L (0.90 US qt) • With filter/strainer: 0.95 L (1.00 US qt) • Complete dry overhaul: 1.05 L (1.11 US qt) |
| OEM Oil Filter Code & Type | 1S7-E3440-00 / HF141 |
| 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: 2.75-21 45P · Rear: 4.10-18 59P (Tube-Type Spoke Rim) |
|---|---|
| Cold Tire Pressure — Solo Riding |
Front: 150 kPa / 1.50 bar / 22 PSI Rear: 175 kPa / 1.75 bar / 25 PSI |
| Cold Tire Pressure — 2-Up / Loaded Touring |
Front: 150 kPa / 1.50 bar / 22 PSI Rear: 200 kPa / 2.00 bar / 29 PSI |
| OEM Spark Plug & Quantity | NGK MR8E-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 · 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 · 16.7 hp @ 10,000 rpm · 14.3 N·m (10.5 lb-ft) @ 6,500 rpm |
|---|---|
| Seat Height & Wet Curb Weight | 880 mm (34.6 in) · 134 kg (295 lbs) |
| Fuel Tank & Est. Real-World Range | 8.1 L (2.1 US gal) · ~40 km/L → ~324 km (201 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
Introduced in 2020 as a liquid-cooled rival to air-cooled 150cc trail bikes, the B3M WR155R pairs a 6-speed 155cc VVA engine with a 41mm conventional fork and 21/18-inch spoke wheels.
Oil & Clutch Mechanical Engineering Note
Using a conventional coil-spring wet clutch rather than the R15’s slipper unit for trail feel, change its 0.95 L (with HF141 filter) of SAE 10W-40 JASO MA2 oil every 2,000 km off-road.