How to Change the Oil in a 2023 Yamaha TTR125L: Complete DIY Guide

Shop parts for a 2023 Yamaha TTR125L Dirt Bike.

MotoSport.com Proprietary Guide

Required Tools and Supplies

  • 8mm or 17mm socket and ratchet (check your specific drain bolt size before starting)
  • Oil catch pan
  • Funnel
  • Shop rags or paper towels
  • New engine oil (Yamalube 10W-40 or as specified in your owner's manual)
  • Replacement drain bolt washer (crush washer) if necessary
  • Gloves (recommended)
  • Torque wrench (recommended for reinstalling the drain bolt)

Preparation

  • Warm up the engine for several minutes to allow oil to thicken and contaminants to suspend for thorough drainage. A short ride or a few minutes of idling is sufficient

    .
  • Once warm, turn off the engine and securely place the bike on its kickstand, which slightly tips the bike left—ideal for draining the oil on the TTR125L

    .

Step-by-Step Oil Change Process

  • Locate the Drain Bolt:
    • The 2023 Yamaha TTR125L has a single oil drain bolt located on the left side of the engine, next to the bottom of the engine case. It’s easy to spot by the “waffles” on the left engine case cover

      .
    • Put the oil pan directly underneath to catch draining oil.
  • Remove the Drain Bolt:
    • Using your socket and ratchet, carefully unscrew the drain bolt. Don’t lose the washer.
    • Allow all the old oil to fully drain. Let gravity do the work–waiting a few minutes helps. You can gently “kick” the engine over by hand a couple of times (with the ignition off) to help remove residual oil

      .
  • Clean and Inspect:
    • While the oil drains, inspect the crush washer—replace it if worn or damaged to prevent leaks when reinstalling

      .
    • Wipe the drain bolt clean and check the threads.
  • Install the Drain Bolt:
    • Once oil stops dripping, reinstall the drain bolt with the washer. Do NOT overtighten. Just snug it firmly by hand and finish with a torque wrench if available. Overtightening can strip the threads or crack the casing

      .
  • Add Fresh Oil:
    • Remove the oil filler cap/dipstick (top left side of the engine case).
    • Insert a funnel and pour in the recommended quantity of new oil (approximately 1.0 liter or as stamped on your case; always cross-reference your owner’s manual)

      .
    • Replace the filler cap/dipstick for now.
  • Check the Oil Level:
    • Start the engine and let it run for 30 seconds to circulate the new oil. Then shut it off and let it rest for a couple of minutes.
    • With the bike upright (not on the kickstand), unscrew the dipstick, wipe it clean, reinsert without screwing in, then remove and check the level. It should fall between the minimum and maximum lines

      .
    • If needed, slowly add oil in small increments, repeating the dipstick check until the oil sits at the recommended mark

      .
  • Final Inspection:
    • Wipe away any spilled oil from the engine and frame.
    • Start the engine one last time and look carefully for leaks at the drain bolt and filler cap.

2023 Yamaha TTR125L Model-Specific Callouts

  • Single Drain Bolt: Unlike some multi-drain systems, there’s just one drain bolt, simplifying oil changes

    .
  • Case Stamping: The correct oil quantity is often stamped on the left engine case. Double check here if unsure

    .
  • Dipstick Checking: Always check oil level with the bike upright and the dipstick fully inserted but NOT threaded in for an accurate reading

    .
  • No replaceable oil filter: The TTR125L uses only a simple screen, so routine oil changes are your main line of engine protection.
  • Routine Maintenance: Combining oil changes with other checks—air filter, chain, and bolts—will help ensure your TTR125L stays in top condition.

Pro Tips from MotoSport.com

  • Use manufacturer-approved engine oil (Yamalube) for best engine life.
  • Change your oil after the first 5 hours on a new bike, then every 10–15 hours depending on riding conditions.
  • Never mix different oil types or brands.
  • Keep a log of oil changes, including date and hours on the engine.

Conclusion

Changing the oil on your 2023 Yamaha TTR125L is a straightforward and critical maintenance task that any owner can do with basic tools. Staying consistent with oil changes will dramatically extend engine life and keep your Yamaha running strong for years.

Related Shopping Categories

Shop Motor Oil for a 2023 Yamaha TTR125L Dirt Bike.

Shop Oil Filters for a 2023 Yamaha TTR125L Dirt Bike.

Shop Oil Drain Pans for a 2023 Yamaha TTR125L Dirt Bike.

Shop Tools for a 2023 Yamaha TTR125L Dirt Bike.

Shop Oil Fillers and Drain Plugs for a 2023 Yamaha TTR125L Dirt Bike.

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.