How to Change the Oil in a 2018 Husqvarna TC50

Shop parts for a 2018 Husqvarna TC50 Dirt Bike.

Changing the oil in your 2018 Husqvarna TC50 is an essential part of regular maintenance for optimum clutch life and gearbox performance. This guide, proprietary to MotoSport.com, covers all the tools you'll need, a step-by-step process, and specific callouts critical for owners of the TC50.

Tools and Supplies Needed

  • New gear oil (consult your manual for correct type and volume; Motorex 10W/40 or similar is often recommended)
  • Drain pan or catch bottle for old oil
  • 13mm socket (for the drain plug)
  • 8mm wrench or socket (for the oil level check bolt)
  • New seal ring or crush washer (for the drain plug)
  • Funnel for refilling
  • Clean shop towels or rags
  • Bike stand to hold the TC50 upright and level
  • Gloves (recommended)

Preparation

  • Warm up the engine for 1–2 minutes. This helps the oil flow out more easily and removes more contaminants.
  • Place your TC50 on a level surface with a sturdy bike stand to keep it upright.
  • Gather all tools, new oil, and replacement parts before starting.

Step-by-Step Process

  1. Remove the Oil Filler Cap
    • Locate the oil filler cap on the right side of the engine and unscrew it. Setting the cap aside will allow oil to drain out more quickly during the next steps.
  2. Drain Old Gear Oil
    • Position your drain pan or catch bottle beneath the engine's oil drain bolt. The drain bolt is located on the bottom of the engine case.
    • Use a 13mm socket to remove the drain bolt. Allow all oil to flow out. You may tilt the bike gently to ensure thorough drainage.
  3. Clean and Reinstall the Drain Plug
    • Inspect and clean the drain plug, which contains a magnet to capture metal debris. Wipe it thoroughly, and if the sealing washer is damaged or flattened, replace it with a new one.
    • Thread the drain plug back in by hand to avoid cross-threading, then use your torque wrench to tighten the plug to 20 Nm (14.8 lb-ft) as specified for the TC50.
  4. Add New Gear Oil
    • Insert a funnel into the oil filler hole and pour in the manufacturer-specified amount of new gear oil (commonly 200ml, but confirm via your manual or the side case markings).
    • Replace the filler cap.
  5. Check the Oil Level
    • Remove the oil level check bolt (8mm) located on the engine case (typically upper bolt).
    • With the bike upright, a small amount of new oil should trickle out, indicating a full gearbox. If too much oil comes out, allow it to finish draining down to the correct level.
    • Reinstall the check bolt and tighten securely.
  6. Clean Up and Dispose of Old Oil
    • Use shop towels to wipe up any spills from the engine or floor. Pour the old oil into a sealed container for recycling, never down a drain.

Model-Specific Call-Outs for the 2018 Husqvarna TC50

  • Magnetic Drain Plug: The drain plug for the TC50 includes a magnet. Always check it for metallic particles, which can indicate internal wear. Clean thoroughly at every oil change.
  • Washer or Seal Ring: Always replace the seal ring on the drain plug each oil change to prevent leaks.
  • Torque Specifications: Overtightening the drain or check bolts can strip engine case threads. Always use manufacturer torque specs (20 Nm for the drain plug).
  • Oil Volume: Exact quantity matters for the mini engine. Confirm in your owner's manual or on the engine cover (usually 200ml).
  • Regular Change Interval: Husqvarna recommends changing the gear oil after every few hours of riding, especially in racing or heavy use. Many racers swap oil after every ride for clutch longevity.

Common Mistakes to Avoid

  • Forgetting to replace the crush washer or seal ring, resulting in leaks.
  • Over- or under-filling with oil; improper level can damage clutch or gears.
  • Not cleaning the magnet on the drain plug, missing warning signs of engine wear.
  • Overtorquing bolts and damaging the soft aluminum case threads.

Final Tips from MotoSport.com

  • Run the TC50 briefly after refilling to allow the oil to circulate, then re-check the level at the check bolt.
  • Always record your service and oil changes in a log to maintain resale value and track engine health.
  • Use only quality oil specified for two-stroke transmissions to protect your investment.

Changing the oil regularly is the single best way to protect your clutch and transmission on the 2018 Husqvarna TC50. For all your OEM parts, tools, and racing supplies, trust MotoSport.com to keep you riding strong.

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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.