Yamaha YZF-R125 (RE39 / RE40 VVA) — OEM Fluid, Tire Pressure & Maintenance Specs
125cc Liquid-Cooled Single SOHC 4-Valve VVA Assist & Slipper Clutch · Source: Yamaha YZF-R125 (RE39 / RE40 VVA) (2019–Present) Official Owner’s Manual Maintenance Specifications
According to the Yamaha YZF-R125 (RE39 / RE40 VVA) (2019–Present) Official Owner’s Manual Maintenance Specifications, the 2019–Present Yamaha YZF-R125 (RE39 / RE40 VVA) (chassis RE39/RE40/RE45) 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 200 kPa / 2.00 bar / 29 PSI front (100/80-17M/C 52S) and 225 kPa / 2.25 bar / 33 PSI rear (140/70-17M/C 66S), 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 225 kPa (2.25 bar)
Est. Range: ~495 km (308 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: 100/80-17M/C 52S · 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 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 Sealed O-Ring Chain — Maintain 30–40 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 | 125 cc · 15 hp @ 9,000 rpm · 11.5 N·m (8.5 lb-ft) @ 8,000 rpm |
|---|---|
| Seat Height & Wet Curb Weight | 820 mm (32.3 in) · 144 kg (317 lbs) |
| Fuel Tank & Est. Real-World Range | 11 L (2.9 US gal) · ~45 km/L → ~495 km (308 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
VVA variable valve actuation and an assist-and-slipper clutch debuted on the 2019 RE39, followed in 2023 (RE45) by R7-style single-projector bodywork, TCS, and a 5-inch TFT.
Oil & Clutch Mechanical Engineering Note
Holding just 0.95 L with paper filter HF141 while sustaining 9,000+ rpm highway speeds, the R125 requires strict 2,500–3,000 km oil changes with SAE 10W-40 JASO MA2.
Garage Wrenching Gotchas
- Keep the three right-side oil filter cover bolts organized by hole position and torque gently to 10 N·m to avoid stripping the thin magnesium/aluminum clutch cover threads.
- With less than one liter in the sump, even 150 ml of high-rpm oil consumption drops the level dangerously—check the unscrewed dipstick upright every 1,000 km.
5. Frequently Asked Questions (FAQ)
What oil volume, JASO grade, and oil filter code does the Yamaha YZF-R125 (RE39 / RE40 VVA) (2019–Present) require?
Because its wet multi-plate clutch shares engine oil with the gearbox, run SAE 10W-40 (JASO MA2) at 0.85 L (0.90 US qt) drain-only and 0.95 L (1.00 US qt) with filter (1S7-E3440-00 / HF141).
How do you accurately check the oil level on the YZF-R125 (RE39 / RE40 VVA), and what are its service intervals?
Hold the bike upright on level ground 2–3 minutes after shutdown, wipe the dipstick, and rest it on the filler threads without screwing it in (threading it in reads artificially high and risks oil starvation). Torque the drain plug to 20 N·m with a new crush washer. Factory oil change intervals are every 3,000 km, with valve clearance inspection every 12,000 km.
What are the cold tire pressures, puncture repair type, seat height, and range of the YZF-R125 (RE39 / RE40 VVA)?
Fitted with 100/80-17M/C 52S 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 820 mm (32.3 in) at 144 kg wet weight, delivering ~495 km per 11 L tank.