How to Change the Oil in a 2021 Husqvarna TX300i

Shop parts for a 2021 Husqvarna TX300i Dirt Bike.

Changing the gear oil in your 2021 Husqvarna TX300i is a critical part of regular maintenance to ensure the longevity and performance of your dirt bike. This job is simple enough for most owners to handle at home, saving you both time and money. MotoSport.com brings you this detailed step-by-step guide to carry out the task efficiently and safely.

Tools and Supplies Needed

  • Ratchet
  • 3-inch extension
  • 13mm socket
  • 8mm socket or T30 Torx
  • Drain pan
  • Torque wrench (recommended for bolt reinstallation)
  • New gear oil (as specified in your owner's manual)
  • Oil funnel (optional, but helps prevent spills)
  • Shop towels or rags
  • Gloves (keeps hands clean and protected)

Before You Start: Specific TX300i Notes

  • The drain bolt on this model is under the shift lever on the left side.
  • If your TX300i has an aftermarket skid plate, it may need removal for direct access to the drain bolt. If your skid plate design allows enough clearance, you can use a flexible funnel like the Drifters Oil Change Moto Funnel to avoid removing the plate entirely.
  • Always use gear oil of the specification and quantity specified in your owner's manual. Over or under-filling can lead to performance or reliability problems.
  • Husqvarna recommends this service every 40 hours after the first 5-hour change, but performing it sooner does no harm.

Step 1: Warm Up the Engine

  • Let the bike idle for several minutes to bring the engine up to operating temperature. This helps the oil flow out more easily, carrying away more contaminants.

Step 2: Prepare the Work Area

  • Support the bike upright on a stand or center it as best as possible.
  • Place the drain pan directly beneath the oil drain bolt on the left side, just under the shift lever.
  • If you have a skid plate covering this area, remove it according to the manufacturer's instructions if you can't direct oil past it cleanly.

Step 3: Remove the Drain Bolt

  • Use your ratchet, 3-inch extension, and 13mm socket to remove the drain bolt.
  • Allow the gear oil to drain completely. This may take a few minutes.
  • Locate the oil fill cap on the right side and remove it. This allows air to flow and oil to drain faster and more thoroughly.

Step 4: Inspect and Clean

  • Examine the drain bolt for any metal debris. Clean it and its crush washer thoroughly before reusing.
  • Use shop towels to wipe away any oil from the motor's exterior and mounting surfaces.

Step 5: Reinstall the Drain Bolt

  • Once all the oil has drained, reinstall the drain bolt (and crush washer if applicable).
  • Torque the bolt to the specification indicated in your owner's manual. If you do not have a torque wrench, tighten the bolt firmly but do not overtighten – stripping the threads is a costly mistake.

Step 6: Add New Gear Oil

  • Place a funnel in the fill port on the right side.
  • Pour in the correct amount and grade of new gear oil (refer to your manual for the exact amount – typically around 800ml for this model, but always check).
  • Replace and tighten the fill cap securely.

Step 7: Check for Leaks and Clean Up

  • Clean up any spilled oil from the engine and cases using a shop towel.
  • Start the engine and let it idle for a minute. Inspect the drain bolt and fill cap area for any signs of leaks.
  • Dispose of the old oil responsibly – most motorcycle shops or auto parts stores accept waste oil for recycling.

Important TX300i Model-Specific Call-Outs

  • The TX300i is a fuel-injected two-stroke with a separate transmission gear oil compartment. Engine and gear oils are not mixed, so always change the right oil type in the right place.
  • Do not reuse old crush washers if they are deformed or damaged; replace as needed for a perfect seal.
  • If you added a magnetic drain plug aftermarket, inspect and clean the magnet for metal shavings every change.
  • Using quality oil and changing it regularly can significantly prolong the life of your clutch and gearbox components.

Final Reminders

  • Oil changes are the single most effective maintenance job you can perform for the health of your motorcycle's engine and gearbox.
  • Label and keep records of your oil changes including date, hours on the bike, and oil brand/type used.
  • Only perform maintenance while the motor is cool enough to be safe to touch, and always run the engine in a well-ventilated area.

This oil change guide is proprietary to MotoSport.com and tailored for the 2021 Husqvarna TX300i. For additional information always consult your motorcycle's owner's manual and follow manufacturer recommendations for your exact model and year.

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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.