Yamaha MT-03 (RH12 / B6W) — OEM Fluid, Tire Pressure & Maintenance Specs
321cc Liquid-Cooled Parallel-Twin DOHC 8-Valve 180° Crank Hyper Naked (Wet Multi-Plate) · Source: Yamaha MT-03 (RH12 / B6W) Official Owner’s Manual Maintenance Specifications
According to the Yamaha MT-03 (RH12 / B6W) Official Owner’s Manual Maintenance Specifications, the 2020–Present Yamaha MT-03 (RH12 / B6W) (chassis RH12/B6W/B9T) requires 1.8 L (1.90 US qt) of SAE 10W-40 (JASO MA2, API SG or higher) engine oil for a drain-only change and 2.1 L (2.22 US qt) with filter service (1WD-E3440-10 / 5GH-13440-80 (HF204)). Standard solo cold tire pressure is 200 kPa / 2.00 bar / 29 PSI front (110/70R17 M/C 54H) and 250 kPa / 2.50 bar / 36 PSI rear (140/70R17 M/C 66H), paired with 2× NGK LMAR8A-9 spark plug(s) and a YTZ8V battery.
Drain only: 1.8 L (1.90 US qt)
R 250 kPa (2.50 bar)
Est. Range: ~350 km (217 mi)
1. Engine Lubrication, Filter & Clutch Specifications
| Clutch Architecture | Wet Multi-Plate Manual Clutch NEVER use JASO MB |
|---|---|
| Recommended Viscosity & Grade | SAE 10W-40 (Alt: SAE 10W-50) · JASO MA2 · API SG or higher |
| Oil Volume (Drain / With Filter / Overhaul) |
• Drain only: 1.8 L (1.90 US qt) • With filter/strainer: 2.1 L (2.22 US qt) • Complete dry overhaul: 2.4 L (2.54 US qt) |
| OEM Oil Filter Code & Type | 1WD-E3440-10 / 5GH-13440-80 (HF204) |
| Correct Oil Level Check Method | Hold bike upright on level ground 3–5 min after warm shutdown; read crankcase sight glass |
| Oil Drain Bolt Torque | 35 N·m (25.8 lb-ft / 3.57 kgf·m) — Use fresh crush washer |
2. Cold Tire Pressures, Wheels, Ignition & Drivetrain
| Front / Rear OEM Tire Sizes | Front: 110/70R17 M/C 54H · Rear: 140/70R17 M/C 66H (Tubeless) |
|---|---|
| Cold Tire Pressure — Solo Riding |
Front: 200 kPa / 2.00 bar / 29 PSI Rear: 250 kPa / 2.50 bar / 36 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 LMAR8A-9 × 2 (Gap: 0.8–0.9 mm) |
| OEM Battery Code & Rating | YTZ8V (12V 7.0Ah MF AGM) |
| Final Drive Maintenance | 520 Sealed O-Ring Chain (112 links, 14T/43T) — Maintain 35–45 mm slack |
| Brake Fluid & Coolant | DOT 4 · Yamalube Aluminum-Safe Ethylene Glycol Coolant (~1.3 L) |
3. Ergonomics, Range & Scheduled Service Intervals
| Displacement · Max Power · Peak Torque | 321 cc · 42 hp @ 10,750 rpm · 29.5 N·m (21.8 lb-ft) @ 9,000 rpm |
|---|---|
| Seat Height & Wet Curb Weight | 780 mm (30.7 in) · 168 kg (370 lbs) |
| Fuel Tank & Est. Real-World Range | 14 L (3.7 US gal) · ~25 km/L → ~350 km (217 mi) |
| OEM Scheduled Maintenance Intervals |
• First Break-In: 1,000 km • Engine Oil / Filter: 5,000 km / 10,000 km • Air Filter / Spark Plug: 15,000 km / 15,000 km • Valve Clearance Check: 42,000 km |
4. Generation Cutoffs & Real-World Wrenching Gotchas
Model-Year & Chassis Generation Notes
The 2020+ Gen 2 MT-03 (B6W/RH12) gained 37 mm KYB USD forks, LED projector styling, radial tires, and NGK LMAR8A-9 plugs—distinct from 2016–2019 conventional-fork RH07 models (CR8E plugs) and unrelated to Europe’s old 2006–2014 660cc single-cylinder MT-03.
Oil & Clutch Mechanical Engineering Note
With zero side fairings in the way, the spin-on oil filter and drain plug sit completely exposed for 15-minute DIY changes; fill 2.1 L (with filter) of SAE 10W-40 JASO MA2 synthetic to protect its high-revving DiASil cylinders.
Garage Wrenching Gotchas
- Because the wide radiator sits completely unshrouded behind the front wheel, install a mesh radiator guard early and never blast cooling fins squarely with a pressure washer.
- Its upright tubular handlebar uses longer clutch and throttle cables than the clip-on YZF-R3—always order MT-03-specific cables and check full lock-to-lock slack if adding bar risers.
5. Frequently Asked Questions (FAQ)
What is the Yamaha MT-03 engine oil capacity with and without filter?
Drain-only refill is 1.8 L (1.9 US qt), and oil with spin-on filter replacement requires 2.1 L (2.2 US qt) of SAE 10W-40 JASO MA2 oil.
What cold tire pressures are specified for the Yamaha MT-03?
Factory cold inflation pressures are 200 kPa (29 PSI) front and 250 kPa (36 PSI) rear.
How does the MT-03 compare to the YZF-R3 for daily street commuting?
While sharing identical engine internals and consumables, the MT-03’s 39 mm higher, 19 mm closer handlebar eliminates wrist strain in traffic and saves fairing-removal labor during routine maintenance.