Yamaha MT-25 (RG43 / RG74) — OEM Fluid, Tire Pressure & Maintenance Specs
249cc Liquid-Cooled Parallel-Twin DOHC 8-Valve Hyper Naked · Source: Yamaha MT-25 (RG43 / RG74) (2020–Present) Official Owner’s Manual Maintenance Specifications
According to the Yamaha MT-25 (RG43 / RG74) (2020–Present) Official Owner’s Manual Maintenance Specifications, the 2020–Present Yamaha MT-25 (RG43 / RG74) (chassis RG43J/RG74J/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-E3440-00 / 5GH-13440-80 (HF204)). Standard solo cold tire pressure is 200 kPa / 2.00 bar / 29 PSI front (110/70-17M/C 54S) and 225 kPa / 2.25 bar / 33 PSI rear (140/70-17M/C 66S), paired with 2× NGK CR8E / LMAR8A-9 spark plug(s) and a GTZ8V / YTX7L-BS battery.
Drain only: 1.8 L (1.90 US qt)
R 225 kPa (2.25 bar)
Est. Range: ~385 km (239 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-E3440-00 / 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 | 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: 110/70-17M/C 54S · Rear: 140/70-17M/C 66S (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: 250 kPa / 2.50 bar / 36 PSI |
| OEM Spark Plug & Quantity | NGK CR8E / LMAR8A-9 × 2 (Gap: 0.7–0.9 mm) |
| OEM Battery Code & Rating | GTZ8V / YTX7L-BS (12V 7.0Ah MF AGM) |
| Final Drive Maintenance | 520 Sealed O/X-Ring Chain — Maintain 25–35 mm slack and lube every 800–1,000 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 | 249 cc · 35.5 hp @ 12,000 rpm · 23 N·m (17.0 lb-ft) @ 10,000 rpm |
|---|---|
| Seat Height & Wet Curb Weight | 780 mm (30.7 in) · 167 kg (368 lbs) |
| Fuel Tank & Est. Real-World Range | 14 L (3.7 US gal) · ~27.5 km/L → ~385 km (239 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: 40,000 km |
4. Generation Cutoffs & Real-World Wrenching Gotchas
Model-Year & Chassis Generation Notes
Upgraded in 2020 (RG43J) with 37mm KYB inverted forks and twin-eye LED projector styling, the 2022+ RG74J MT-25 added Euro 5 compliance and optional quickshifter wiring.
Oil & Clutch Mechanical Engineering Note
Sharing its bottom end with the MT-03, the MT-25 takes 2.1 L of SAE 10W-40 JASO MA2 oil with filter HF204, verified upright through the lower right crankcase window.
Garage Wrenching Gotchas
- If installing taller handlebar risers, reroute the clutch cable cleanly so the outer sheath cannot contact the hot right-hand exhaust header.
- Because the recessed ignition barrel ahead of the tank collects rainwater when parked outdoors, lubricate the lock tumblers periodically with dry PTFE lock spray.
5. Frequently Asked Questions (FAQ)
What oil volume, JASO grade, and oil filter code does the Yamaha MT-25 (RG43 / RG74) (2020–Present) require?
Because its wet multi-plate clutch shares engine oil with the gearbox, run SAE 10W-40 (JASO MA2) at 1.8 L (1.90 US qt) drain-only and 2.1 L (2.22 US qt) with filter (1WD-E3440-00 / 5GH-13440-80 (HF204)).
How do you accurately check the oil level on the MT-25 (RG43 / RG74), and what are its service intervals?
Hold the motorcycle dead-vertical on level ground 2–3 minutes after warm shutdown and verify the oil sits mid-way between the Upper and Lower marks in the crankcase sight glass—never on the sidestand. Torque the drain plug to 20 N·m with a new crush washer. Factory oil change intervals are every 5,000 km, with valve clearance inspection every 40,000 km.
What are the cold tire pressures, puncture repair type, seat height, and range of the MT-25 (RG43 / RG74)?
Fitted with 110/70-17M/C 54S front and 140/70-17M/C 66S rear tubeless rims (compatible with roadside plug kits), set cold tire pressures to 29 / 33 PSI (200/225 kPa) solo or 29 / 36 PSI loaded. Seat height is 780 mm (30.7 in) at 167 kg wet weight, delivering ~385 km per 14 L tank.