How to Change the Coolant in a 2017 Yamaha TTR125L

Shop parts for a 2017 Yamaha TTR125L Dirt Bike.

The 2017 Yamaha TTR125L is a reliable, air-cooled trail bike that is easy to maintain and built tough for adventurous riders. Though this model traditionally features an air-cooled engine rather than a liquid-cooled system, many owners confuse the engine oil change for a coolant flush due to terminology overlap. If your TTR125L is stock, you do not need to perform a coolant change, as it does not have a radiator or liquid cooling system. Instead, you should periodically check and replace the engine oil for optimal performance and engine life.

If you have installed or are maintaining a rare aftermarket liquid-cooled head or custom kit (which is uncommon), reference your product's specific instructions. For standard maintenance, follow the guide below for oil changes, which is the closest equivalent for the TTR125L:

Items You Will Need

  • Fresh four-stroke motorcycle engine oil (consult owner's manual for correct viscosity)
  • Oil drain pan
  • Socket wrench set
  • Clean rag
  • Replacement oil filter (if applicable)
  • Funnel
  • Gloves (optional)

Step-by-Step Oil Change Guide for the TTR125L

  • Warm up the engine for a few minutes to thin the oil, then turn off the bike and let it cool for several minutes before starting the service.
  • Locate the oil drain bolt on the underside of the engine.
  • Place the drain pan beneath the drain bolt and use the socket wrench to carefully remove it. Allow all oil to drain completely.
  • Replace the drain bolt and torque it to the factory specification (usually hand-tight plus a quarter turn, but always check your manual).
  • If your model uses a replaceable oil filter, remove and replace the oil filter now.
  • Pour fresh engine oil into the fill port using a funnel, following the recommended oil capacity for the TTR125L.
  • Start the engine and let it idle for a minute, then shut it off and re-check the oil level. Add oil if necessary.
  • Dispose of used oil responsibly at your local recycling center.

Important Notes For 2017 Yamaha TTR125L Owners

  • This model is air-cooled and does not require or use engine coolant unless you have installed a specific aftermarket liquid cooling kit. For all stock bikes, oil changes are your key engine maintenance.
  • If your TTR125L is behaving unusually hot, check for blockages around the cylinder fins or restricted airflow rather than suspecting coolant issues.
  • For enhanced protection, always use quality oil designed for off-road four-stroke engines to meet Yamaha's recommendations and get the most life out of your machine.

Stay on top of your maintenance routine, and your TTR125L will provide years of reliable, trail-ready performance. For all your parts and accessory needs, MotoSport has you covered.

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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.