How to Change the Oil in a 2019 Husqvarna TC125

Shop parts for a 2019 Husqvarna TC125 Dirt Bike.

Changing the oil in your 2019 Husqvarna TC125 is an essential maintenance task that keeps your bike running at peak performance and helps protect the engine from premature wear. This guide, proprietary to MotoSport.com, walks you step-by-step through the process, including the tools you will need, key model-specific tips, and professional best practices to ensure a smooth oil change every time.

Tools & Supplies Needed

  • 13mm box end wrench or ratchet with 13mm socket
  • Shop rags or towels
  • Drain pan (to catch old oil)
  • Oil fill funnel (optional, but helpful for spill-free pouring)
  • New crush washer (recommended each oil change)
  • Brake cleaner or similar degreaser (for cleaning bolt and area)
  • Torque wrench (for precise tightening)
  • High-quality gear oil; 2019 TC125 uses 15W-50 engine/gear oil, with a capacity of 0.8 liters (0.85 quarts) for this model

Step-by-Step Oil Change Procedure

  1. Warm up the Engine
    • Start and idle the bike for 3-5 minutes to warm the engine. Warm oil flows and drains much more easily, helping you remove more of the old oil from the gearbox.
  2. Prepare Your Bike
    • Place the bike on a stand for stability. Make sure the bike is upright–this ensures all oil can drain completely.
    • Wipe the area around the drain plug and oil fill cap to prevent dirt from getting inside the engine.
  3. Remove the Engine/Transmission Oil Drain Plug
    • Locate the oil drain plug on the bottom of the engine. On the TC125, this bolt is accessible from underneath and generally requires a 13mm wrench.
    • Place the drain pan beneath the plug, then use your wrench to loosen and carefully remove the drain plug. (Caution: oil may be hot.)
    • Allow all the old oil to drain completely. This may take several minutes.
  4. Clean and Inspect the Drain Plug
    • Clean the magnet (if equipped) and the threads of the drain plug. The magnet catches any metallic debris; finding a few small filings is normal, but large or excess debris can indicate internal wear.
    • Remove and replace the crush washer if worn or flattened to prevent leaks. Clean the sealing surface on the engine case as well.
  5. Reinstall the Oil Drain Plug
    • Hand-thread the plug, then use a torque wrench to tighten to the factory spec: 20 Nm (14.8 lb-ft) for the TC125 drain plug. Overtightening can strip the threads or crack the case, so use a torque wrench for this step

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  6. Fill with Fresh Oil
    • Remove the oil fill cap, usually located on the right side of the engine case.
    • Using a funnel, pour in 0.8 liters (800 ml or 0.85 quarts) of high-quality 15W-50 gear oil. Be careful not to overfill; check your shop manual or owner's manual for exact recommended type and quantity

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    • Replace and tighten the oil fill cap securely.
  7. Check for Leaks & Test
    • With the bike still on the stand, start and idle the engine for a minute, then turn it off and check around the drain plug and oil fill cap for leaks.
    • Wait a few minutes, then check the oil level with the bike upright. Add oil if necessary, but be careful not to overfill.

2019 Husqvarna TC125 Specific Call-Outs

  • Oil Capacity: 0.8 liters. Overfilling the gearbox can cause the oil to foam, leading to poor lubrication and shifting issues.
  • Crush Washer: Replace the washer at every oil change for leak-free performance.
  • Drain Plug Torque: Always use a torque wrench at 20 Nm (14.8 lb-ft) for the drain plug to avoid overtightening or stripping the threads

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  • Oil Recommendation: Use a high-quality 15W-50 motorcycle-specific oil designed for gearboxes, not automotive oil.
  • Magnetic Drain Plug: Inspect for debris at every service–a normal amount of fine metallic particles is expected, but excessive metal calls for internal inspection.
  • Warm Up Oil: Always warm up your bike before draining oil, especially in cooler conditions, to ensure the oil flows out smoothly and contaminants leave with it

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Extra Tips from the Pros

  • Dispose of oil responsibly. Used oil is hazardous—take it to a recycling center or hazardous waste facility.
  • Keep records of each oil change for warranty and resale value.
  • Inspect for leaks or signs of cross-threading at every change.
  • Consider using a factory oil change kit for the TC125, which often includes OEM-spec oil, washers, and sometimes even a drain plug for convenience

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Conclusion

By following these detailed instructions, you'll keep your 2019 Husqvarna TC125's engine protected and running smooth. Regular oil changes are a small investment for the long-term health and performance of your dirt bike.

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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.