Yamaha YZF-R25 Gen 1 (RG10J) — OEM Fluid, Tire Pressure & Maintenance Specs
249cc Liquid-Cooled Parallel-Twin DOHC 8-Valve 14,000rpm Redline · Source: Yamaha YZF-R25 Gen 1 (RG10J) (2014–2018) Official Owner’s Manual Maintenance Specifications
According to the Yamaha YZF-R25 Gen 1 (RG10J) (2014–2018) Official Owner’s Manual Maintenance Specifications, the 2014–2018 Yamaha YZF-R25 Gen 1 (RG10J) (chassis RG10J/1WD/2WD) 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: ~371 km (231 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 · 36 hp @ 12,000 rpm · 22.6 N·m (16.7 lb-ft) @ 10,000 rpm |
|---|---|
| Seat Height & Wet Curb Weight | 780 mm (30.7 in) · 166 kg (366 lbs) |
| Fuel Tank & Est. Real-World Range | 14 L (3.7 US gal) · ~26.5 km/L → ~371 km (231 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
Debuting in 2014 (RG10J) as the template for the R3, Gen 1 R25 features dual halogen headlights and 41mm conventional forks in both non-ABS (1WD) and ABS (2WD) trims.
Oil & Clutch Mechanical Engineering Note
Spinning to a 14,000 rpm redline, refresh its 2.1 L (with HF204 filter) of SAE 10W-40 JASO MA2 synthetic oil every 4,000–5,000 km to keep the cam chain quiet.