How to Change the Oil in a 2025 Husqvarna TC125: Complete DIY Guide

Shop parts for a 2025 Husqvarna TC125 Dirt Bike.

Regularly changing the oil in your 2025 Husqvarna TC125 is essential to maintain optimal engine performance and longevity. This proprietary step-by-step guide from MotoSport.com is designed specifically for the 2025 TC125, including the tools you'll need, important call-outs for this model, and pro tips to ensure a smooth oil change. Always refer to your owner's manual for additional details relevant to your specific bike.

Tools & Supplies You'll Need

  • 13mm box-end wrench (for oil drain bolt)
  • Drain pan
  • Measuring cup (minimum 800 ml capacity)
  • 800ml of recommended two-stroke transmission oil
  • Torque wrench (to properly secure drain bolt and oil cap)
  • Contact cleaner (for cleaning excess oil or dirty surfaces)
  • New oil drain bolt washer/crush washer (recommended)
  • Nitrile gloves
  • Shop towels or rags

Important Model-Specific Information

  • Oil Capacity: 800 ml for the 2025 TC125 (verify in your owner’s manual for any updates specific to your bike)
  • Oil Filter: The TC125 typically uses a screen rather than a replaceable filter; check and clean it during oil changes if accessible

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  • Drain Bolt Size: 13mm (as of the 2024 model, expect unchanged for 2025)

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  • Drain Bolt Location: Underside of the right side of the engine. The drain bolt is easy to access, but make sure the area is clean before removal to avoid contamination

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How to Change the Oil: Step-by-Step Instructions

  1. Warm Up the Engine
    • Start the bike and let it warm up for 2-3 minutes. Warmer oil drains faster and carries more contaminants with it

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    • Shut the engine off and place your bike securely on a stand.
  2. Remove the Oil Drain Bolt
    • Put on nitrile gloves to keep your hands clean.
    • Position your drain pan directly underneath the drain bolt.
    • Use the 13mm wrench to loosen and remove the drain bolt

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    • Allow the oil to drain fully into the pan; tipping the bike gently side to side ensures complete drainage.
  3. Inspect and Clean
    • If your model uses a magnetic drain bolt, check for metal shavings. A small amount is normal, but excessive metal indicates internal wear

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    • Wipe the drain bolt clean, replace the washer if needed, and clean the area around the oil port with a rag and contact cleaner.
    • Optional: If accessible, remove and clean the oil screen/strainer following the owner’s manual guidance.
  4. Replace the Oil Drain Bolt
    • Reinstall the cleaned drain bolt with a new washer and hand tighten, then use the torque wrench to secure to factory-spec torque.
      Do not overtighten to avoid stripping the threads.
  5. Refill with Fresh Oil
    • Locate and remove the oil fill cap (top or side of right engine case).
    • Measure 800ml of recommended oil and pour it slowly into the fill port using a funnel to avoid spills

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    • Double-check the oil level using the bike’s inspection window or dipstick if equipped (refer to owner’s manual procedures).
    • Reinstall the oil fill cap and tighten securely.
  6. Check for Leaks & Test
    • Start the bike and let it idle for about a minute.
    • Check around the drain bolt and oil fill cap for any signs of leaking oil.
    • Turn the engine off and inspect the oil level again, topping off if necessary.

Owner’s Tips & Troubleshooting for 2025 Husqvarna TC125

  • If you ride in very muddy, wet, or dusty conditions, consider shortening your oil change intervals for better performance and reliability.
  • Always use only high-quality transmission oil designed for two-stroke dirt bikes of this class, as specified by Husqvarna

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  • Inspect the old oil for milky coloration (which could indicate coolant mixing) or excessive metal (potential internal issues).
  • If you feel resistance or notice threads stripping upon reinstallation, stop and inspect the threads before proceeding — cross-threading is a common, easily preventable error.

Conclusion

Changing the oil on your 2025 Husqvarna TC125 is a straightforward process that ensures maximum engine performance and protection. Keeping up with this essential maintenance task will help preserve your bike’s reliability, especially on the track or trails. For more model-specific guides and premium service parts, stick with MotoSport.com — your trusted dirt bike maintenance resource.

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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.