How to Change the Oil in a 2020 Husqvarna TX300i

Shop parts for a 2020 Husqvarna TX300i Dirt Bike.

Changing the oil in your 2020 Husqvarna TX300i is a straightforward maintenance task you can accomplish at home, ensuring your bike’s longevity and optimal performance. This guide provides a detailed, step-by-step process tailored specifically for the TX300i, with all the unique considerations you’ll need as an owner of this model.

Tools and Supplies Needed

  • Ratchet
  • 3-inch extension
  • 13mm socket
  • 8mm socket or T30 Torx
  • Drain pan
  • Torque wrench (recommended)
  • Funnel (Drifter Product-style oil change funnel or similar is recommended for easier oil control)
  • Shop towels
  • Recommended gear/transmission oil (refer to your owner’s manual for the correct type and volume–typically about 0.75L for this model)
  • Replacement crush washer for the drain bolt (recommended but not always necessary)

Preparation

  • Skid plate removal: If your TX300i has an aftermarket skid plate, it should be removed for easy access to the drain plug and to prevent oil spillage on the plate. Follow your skid plate manufacturer’s instructions for removal. It is possible to change the oil without removing the skid plate by using a specially designed funnel, but you risk making a mess if not careful .
  • Warm up the engine: Start your bike and let it idle for a few minutes. This step allows the oil to warm up slightly, lowering its viscosity so it drains out more thoroughly .

Steps to Change the Oil

  • 1. Place the drain pan and access the drain bolt: Position the drain pan under the left side of the engine, beneath the shift lever where the oil drain bolt is located. If the skid plate is still on, use a low-profile funnel to channel the oil safely into the pan without spilling .
  • 2. Remove the drain bolt: Use your 13mm socket and ratchet (add the extension if needed) to loosen and remove the drain bolt. Allow the oil to fully drain from the gearbox. The TX300i typically only needs its transmission (gearbox) oil changed, as it is a two-stroke with separate engine and gearbox oil .
  • 3. Remove the oil fill cap: On the right side of the motorcycle, remove the oil fill cap. This allows air in and helps the old oil drain out faster and more completely .
  • 4. Inspect and clean: While oil is draining, inspect the drain bolt and crush washer for wear or damage. Clean them with a shop towel. Replace the crush washer if needed to ensure a proper seal .
  • 5. Reinstall the drain bolt: Once all old oil has drained, reinstall the drain bolt (use a new crush washer if available). Tighten by hand initially, then use the torque wrench to tighten to the manufacturer’s specified torque (consult your owner’s manual, but it’s typically around 10–12 Nm for this model). Avoid overtightening to prevent case damage .
  • 6. Add fresh oil: Place a clean funnel in the oil fill opening on the right case. Pour in the recommended volume and type of fresh gear oil. Husqvarna recommends about 0.75L, but always check your manual and use the sight glass or level bolt if equipped .
  • 7. Reinstall oil fill cap: Once the correct amount of oil has been added, securely reinstall the fill cap.
  • 8. Clean up: Wipe any spilled oil from the engine and frame. Be sure to properly dispose of used oil and the old crush washer in accordance with local regulations; never pour oil onto the ground or down a drain .
  • 9. Start and check for leaks: Start the engine and let it idle for a few minutes. Check the drain bolt and fill cap area for any leaks. If everything is dry, you’re good to go.

Model-Specific Call-Outs for the 2020 Husqvarna TX300i

  • Gear oil only: The TX300i is a two-stroke with separate gear oil and uses premix or injection for the engine. Only change the transmission/gearbox oil–the process above is correct for this .
  • Access with skid plate: Many owners fit aftermarket skid plates. You may need to remove it for less mess, but using a funnel designed to fit under the case can eliminate this extra step .
  • Oil volume and intervals: For the TX300i, the gearbox oil capacity is about 0.75 liters. Husqvarna recommends changing the gear oil after the first 5 hours of use, then every 40 hours, or sooner if the bike is ridden aggressively or in harsh conditions .
  • Check the manual: Always confirm oil type and torque specifications in your official owner's manual.
  • Avoid overfilling: Too much oil can cause clutch drag or leaks. Use the sight glass or level plug if supplied.

Final Tips

  • Keep a service log for your oil changes and use high-quality gear oil as specified by Husqvarna.
  • Dispose of waste oil responsibly to protect the environment.
  • If you ride in wet, dusty, or extreme conditions, consider changing the oil more frequently for maximum performance and protection .

This guide is proprietary to MotoSport.com and is specific to the 2020 Husqvarna TX300i. Proper care and timely oil changes will keep your TX300i running strong for seasons 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.