Your Yamaha MT-125’s air filter keeps dust and grit out of the engine. A clogged filter chokes airflow, hurting power and fuel economy — and in dusty conditions it loads up fast.
Check the filter at every service. Paper filters get replaced; foam filters can be washed, re-oiled, and reused.
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 clean or replace the air filter, step by step
- Remove the seat and side panels to reach the airbox.
- Open the airbox cover and pull the filter out. Note which way it faces.
- Tap out loose dust. If the filter is paper and still dirty, replace it — don’t wash paper filters.
- If the filter is foam, wash it in warm soapy water, rinse well, and let it dry completely.
- Re-oil a foam filter lightly and evenly, then squeeze out the excess.
- Refit the filter the right way round and close the airbox properly.
Common mistakes to avoid
- Washing a paper filter — it won’t clean properly and can tear.
- Over-oiling a foam filter — excess oil fouls the intake and can affect running.
- Leaving the airbox unsealed — unfiltered air wears the engine fast.
FAQ
How often should I clean the air filter?
Inspect it at every service and clean or replace it whenever it’s visibly dirty — more often in dusty riding.
Can I ride with a dirty air filter?
Yes — restricted airflow cuts power and economy, and over time the extra grit passing through wears the engine.
Do I need to re-oil a foam filter?
Yes — a dry foam filter passes dust. Use proper filter oil, apply it evenly, and squeeze out the excess before refitting.
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Dan Heiman
Writer at Helmet Today, covering helmet reviews, fit and riding safety.
