How to Change the Oil in a 2006 Yamaha TTR125L

Shop parts for a 2006 Yamaha TTR125L Dirt Bike.

Keeping your 2006 Yamaha TTR125L running strong means regular maintenance, and an oil change is one of the easiest, most important tasks. This proprietary MotoSport.com guide covers, step by step, everything you need to know to change the oil on your TTR125L, including the tools required and specific notes for your bike.

Tools and Supplies Needed

  • 12mm socket wrench (for drain bolt)
  • Torque wrench (recommended for drain bolt and oil filter cap)
  • Oil drain pan
  • Clean rags or shop towels
  • Funnel
  • One quart of 10W-40 four-stroke engine oil (Yamalube or equivalent)
  • New oil filter (optional, check if your model uses an external filter or screen)
  • Nitrile gloves (optional to keep your hands clean)

Preparation

  • Warm up the engine for a few minutes to help the old oil flow out more easily. Let the bike idle, then shut it off.
  • Place the bike on its kickstand - the TTR125L leans to the left, which helps oil drain.

Drain the Old Oil

  • Locate the drain bolt on the lower left side of the engine, near the foot peg or “waffles” design on the case; this is the only drain bolt on your TTR125L.
  • Position your oil drain pan below the bolt.
  • Using a 12mm socket, carefully loosen and remove the drain bolt. Be cautious as the oil may be hot.
  • Let the oil drain completely for several minutes. For best results, you can slowly kick the engine over a few times by hand (with the ignition OFF) to help pump out any remaining oil.

Inspect and Clean

  • Inspect the condition of the drained oil for metallic debris or signs of contamination.
  • Wipe the drain bolt clean, and inspect the bolt’s threads and crush washer. Replace the washer if damaged or worn.
  • “I always like to thank the Japanese manufacturers that put the amount right here on the case”—the factory often stamps recommended oil quantity on the engine case for reference. In the TTR125L’s case, it’s generally about 1 quart (approx. 950 mL).

Optional: Oil Screen Maintenance

  • The TTR125L typically uses an internal oil screen rather than an external canister filter. You may wish to clean the oil screen by removing the cover and rinsing it in fresh engine oil. Replace if severely dirty or damaged (refer to your owner’s manual for this advanced step).

Reinstall the Drain Bolt

  • Thread the drain bolt back in by hand first to avoid cross-threading.
  • Use the torque wrench to tighten to 15 lb-ft (20 Nm). Never over-tighten as TTR125L threads are easy to strip.

Add New Oil

  • Remove the oil filler cap located near the top right of the engine.
  • Using a funnel, pour in roughly one quart (950 mL) of 10W-40 four-stroke oil. Start with slightly less if you have doubts, as it’s easier to add than remove oil.
  • Reinstall the filler cap securely.

Check Oil Level

  • Start the bike and let it run for 1-2 minutes, then shut it off.
  • With the bike standing upright (not on the kickstand), remove and wipe off the dipstick. Insert it back, then remove and check the level. Add oil as needed to bring the level to the “Full” mark. Don’t overfill.

Inspect for Leaks and Final Steps

  • Inspect around the drain bolt and oil cap for leaks.
  • Run the engine for a few minutes, recheck the oil level, and top up if necessary. It’s common for the level to drop slightly as the new oil circulates.
  • Properly dispose of the old oil and any used cleaning materials at a recycling center.

2006 Yamaha TTR125L-Specific Tips and Callouts

  • Oil Capacity: Approximately 1 quart (950 mL), but always check the stamp on the right engine case or confirm in the owner’s manual.
  • Drain Bolt: The aluminum threads in the crankcase are soft. Never over-tighten–use the torque value and check for smooth re-threading.
  • No Paper Oil Filter: The TTR125L uses an oil screen, not a paper canister oil filter. Clean it every few oil changes for long-term reliability.
  • Engine Lean: The bike’s left-leaning kickstand helps drain oil completely from the sole left-side drain bolt.
  • Check the Filler Cap O-Ring: Inspect for cracks or wear before installation to prevent leaks.

Conclusion

That’s it. Changing the oil in your 2006 Yamaha TTR125L is straightforward, can be completed with basic hand tools, and only takes about 30 minutes. Regular oil changes help ensure engine longevity and performance—refer to your owner’s manual for the recommended service intervals, and remember to use high-quality oil for best results. For Yamalube, OEM parts, and more, MotoSport.com is your one-stop shop for all your Yamaha dirt bike needs.

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Disclaimer: This guide is provided for general informational purposes only and is not intended to replace your motorcycle's official owner's manual. Always refer to your manufacturer's documentation for model-specific instructions, torque specifications, safety procedures, and maintenance requirements. If you are unsure or inexperienced, consider seeking assistance from a qualified mechanic or technician.