Yamaha MT-125 (RE39 / RE40 VVA) — OEM Fluid, Tire Pressure & Maintenance Specs
125cc Liquid-Cooled Single SOHC 4-Valve VVA Assist & Slipper Clutch · Source: Yamaha MT-125 (RE39 / RE40 VVA) (2020–Present) Official Owner’s Manual Maintenance Specifications
According to the Yamaha MT-125 (RE39 / RE40 VVA) (2020–Present) Official Owner’s Manual Maintenance Specifications, the 2020–Present Yamaha MT-125 (RE39 / RE40 VVA) (chassis RE39/RE40/RE46) 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: ~455 km (283 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 Drive Chain — Maintain 20–30 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 | 810 mm (31.9 in) · 142 kg (313 lbs) |
| Fuel Tank & Est. Real-World Range | 10 L (2.6 US gal) · ~45.5 km/L → ~455 km (283 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
Overhauled for 2020 (RE39/RE40) with the VVA 4-valve engine, slipper clutch, and twin-eye LED face, the MT-125 gained a 5-inch color TFT and traction control in 2023 (RE46).
Oil & Clutch Mechanical Engineering Note
Lubricating both the VVA rocker pin and assist-slipper wet clutch with just 0.95 L of SAE 10W-40 JASO MA2 oil (with HF141 filter), adhere strictly to 3,000 km drain intervals.
Garage Wrenching Gotchas
- Release all recessed plastic push-rivets inside the forward intake scoops before pulling the 10 L tank shrouds, or the locking tabs will snap cleanly off.
- Catch the internal spring and thimble mesh screen carefully if removing the large lower strainer plug alongside routine right-side paper filter changes.
5. Frequently Asked Questions (FAQ)
What oil volume, JASO grade, and oil filter code does the Yamaha MT-125 (RE39 / RE40 VVA) (2020–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 MT-125 (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 MT-125 (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 810 mm (31.9 in) at 142 kg wet weight, delivering ~455 km per 10 L tank.