How to Change the Oil in a 2019 Yamaha TTR125L: The Complete MotoSport.com Guide

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Changing the oil in your 2019 Yamaha TTR125L is a straightforward, essential maintenance task that will help keep your bike running smoothly and reliably for years to come. This guide from MotoSport.com covers all the specific steps – from tools needed, to model-specific tips – so you can complete your oil change with confidence.

Tools & Materials Needed

  • 10mm socket or wrench (for drain bolt)
  • Drain pan (to catch old oil)
  • New engine oil (Yamalube 10W-40 or manufacturer-approved equivalent)
  • Clean funnel (optional, for pouring)
  • Rags or paper towels (for cleanup and wiping dipstick)
  • Torque wrench (optional, for precise tightening)
  • Replacement drain bolt gasket (recommended but not always necessary)
  • Gloves (optional, for cleanliness and safety)

Step-by-Step Oil Change Process

  1. Warm Up the Engine
    • Start and run the engine for a few minutes. This helps the oil to become less viscous and ensures more complete draining.
    • Ensure the bike is on a level surface, preferably with the kickstand down. The TTR125L leans to the left on its stand, which aids drainage

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  2. Locate and Remove the Drain Bolt
    • On the left side of the bike, locate the drain bolt near the bottom of the engine (“by the waffles”)

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    • Position the drain pan directly beneath the bolt.
    • Using your 10mm socket or wrench, loosen and remove the bolt. Be careful – the oil may be hot.
  3. Drain the Oil
    • Let all the oil drain out. Tilt the bike slightly upright if necessary for a moment to get a complete drain

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    • If you want to maximize drainage, you can gently kick the engine over with the kickstarter a couple of times (do not start the engine) to circulate leftover oil out of the crankcase

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  4. Replace the Drain Bolt and Gasket
    • Inspect the drain bolt gasket. If it’s old, cracked, or flattened, replace it with a new one to prevent leakage

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    • Carefully screw the drain bolt back in. Do not overtighten as the TTR125L’s case is aluminum and easy to strip. Just snug and secure is sufficient (about 14 ft-lb recommended)

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  5. Add New Oil
    • Remove the right side oil filler cap/dipstick.
    • Using a funnel, pour in the new oil (see specific quantity below).
    • The manufacturer’s case stamping displays oil capacity: for the 2019 TTR125L, add approximately 1.0 liter (1.06 US qt) of oil. Always check for your specific model’s marking and consult your owner’s manual if in doubt

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    • Reinstall the oil filler cap/dipstick.
  6. Check Oil Level
    • Start the bike and let it idle for a minute, then shut it off.
    • Wait 2–3 minutes for oil to settle.
    • Hold the bike upright (not leaning). Unscrew, wipe, and reinsert the dipstick without threading it in, then pull out and check oil level. Oil should be between the minimum and maximum marks

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    • Add a small amount more oil if needed, rechecking as you go. Do not overfill.
  7. Clean Up
    • Wipe up any oil drips or residue around the engine and on the skid plate/frame.
    • Dispose of the used oil responsibly at a recycling center or automotive store.

2019 Yamaha TTR125L Model-Specific Call-Outs

  • No oil filter to replace: This bike uses a simple oil screen (strainer) instead of a traditional replaceable oil filter. For most oil changes, you don’t need to remove or clean the screen unless you see signs of contaminated oil or after heavy use

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  • Markings on the case: The left side engine case conveniently displays oil capacity, so double check the stamping before adding oil

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  • Single drain bolt: Unlike some bikes with multiple drains, the TTR125L only uses one, making the process straightforward

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  • Torque specifications: Always avoid overtightening the aluminum drain bolt to prevent stripping the threads. “Just snug” is sufficient

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Extra Tips for Success

  • Check oil level before every ride, not just after oil changes

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  • If you spill oil on the engine, wipe it away to avoid smoking or odors during your next ride.
  • Log your maintenance date and mileage for best long-term care.

Final Notes

  • The oil change procedure is identical for most Yamaha TTR125L years and variants – always verify your owner’s manual for any year-specific notes

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  • Changing oil regularly (every 10–20 hours of riding or at least twice per season) will help keep your TTR running strong for years to come.

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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.