Tire pressure is the easiest performance and safety check on your Yamaha MT-125 — and one of the most commonly skipped. The correct pressure is 26 PSI front / 29 PSI rear.
Check pressures cold, before you ride. Tires warm up quickly and pressure rises as they do, so a hot reading will mislead you.
Yamaha MT-125 quick service specs
| Item | Specification |
|---|---|
| Engine oil | 10W-40 (API SG or higher, JASO MA) |
| Oil capacity | 0.95 liters |
| Oil change interval | 2500 miles |
| Chain slack | 30-40 mm |
| Spark plug | NGK MR8E9 |
| Tire pressure (F/R) | 26 PSI front / 29 PSI rear |
| Battery | your owner’s manual |
How to check and adjust tire pressure, step by step
- Check the tires cold — before riding or at least three hours after your last ride.
- Remove the valve caps and press a gauge firmly onto each valve stem.
- Inflate or deflate to 26 PSI front / 29 PSI rear, using the gauge — not the number on the tire sidewall.
- Don’t forget the rear — and re-check after adding a passenger or luggage (see your manual’s loaded spec).
- Refit the valve caps snugly and note any tire that keeps losing air.
Common mistakes to avoid
- Checking hot tires — pressure reads high and you’ll under-inflate.
- Trusting the sidewall number — that’s the tire’s maximum, not your bike’s spec.
- Ignoring a slow leak — a tire that drops a few PSI every week needs attention, not just a top-up.
FAQ
What is the correct tire pressure for a Yamaha MT-125?
26 PSI front / 29 PSI rear, measured cold. Check your owner’s manual for the loaded (two-up) pressure.
How often should I check tire pressure?
At least once a week and before any long ride. Tires naturally lose a little air over time, and temperature changes shift the reading.
Does cold weather change tire pressure?
Yes — roughly 1 PSI per 10°F. Check more often in winter and top up when the temperature drops.
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Dan Heiman
Writer at Helmet Today, covering helmet reviews, fit and riding safety.
