Yamaha YZF-R25 (RG43 / RG74) — OEM Fluid, Tire Pressure & Maintenance Specs
249cc Liquid-Cooled Parallel-Twin DOHC 8-Valve 180-Degree Crank · Source: Yamaha YZF-R25 (RG43 / RG74) (2019–Present) Official Owner’s Manual Maintenance Specifications
According to the Yamaha YZF-R25 (RG43 / RG74) (2019–Present) Official Owner’s Manual Maintenance Specifications, the 2019–Present Yamaha YZF-R25 (RG43 / RG74) (chassis RG43J/RG74J/BS7) 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: ~378 km (235 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 · 22.6 N·m (16.7 lb-ft) @ 10,000 rpm |
|---|---|
| Seat Height & Wet Curb Weight | 780 mm (30.7 in) · 169 kg (373 lbs) |
| Fuel Tank & Est. Real-World Range | 14 L (3.7 US gal) · ~27 km/L → ~378 km (235 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
Updated in 2019 (RG43J, later Euro 5 RG74J) with 37mm KYB upside-down forks and M1-inspired aero bodywork, the 249cc R25 wears bias-ply tires rather than the R3’s radials.
Oil & Clutch Mechanical Engineering Note
Revving past 12,000 rpm with a 60.0 mm bore, the R25 shares the R3’s crankcase and spin-on filter HF204 (2.1 L refill) and thrives on shear-stable SAE 10W-40 JASO MA2 synthetic.
Garage Wrenching Gotchas
- Torque the 12mm oil pan drain bolt strictly to 20 N·m with a fresh crush washer—over-tightening cracks or strips the thin cast-aluminum sump pan.
- Check the coolant expansion reservoir and water-pump weep hole whenever the right lower fairing is off for spin-on oil filter access.
5. Frequently Asked Questions (FAQ)
What oil volume, JASO grade, and oil filter code does the Yamaha YZF-R25 (RG43 / RG74) (2019–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 YZF-R25 (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 YZF-R25 (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 169 kg wet weight, delivering ~378 km per 14 L tank.