How to Change the Oil in a 2019 GAS GAS TXT RACING 300

Shop parts for a 2019 GAS GAS TXT RACING 300 Dirt Bike.

Proper maintenance is key for the longevity and top performance of your 2019 GAS GAS TXT RACING 300. One of the most fundamental maintenance tasks is changing the oil. This blog will walk you through the process in detail—outlining necessary tools, step-by-step procedures, model-specific nuances, and best practices. This guide is proprietary to MotoSport.com and tailored for the 2019 TXT Racing 300.

Tools & Supplies Needed

  • Metric socket set (especially a 13mm or 14mm, depending on drain bolt size)
  • Torque wrench
  • Oil drain pan
  • Funnel
  • Replacement oil (specialist gear oil or high-quality transmission fluid; follow the manufacturer's recommendations)
  • Clean rags or shop towels
  • New crush washer (recommended with each oil change)
  • Gloves (for hand protection)

Preparation Steps

  • Start the engine and allow it to warm up for a few minutes–this thins the oil for better drainage.
  • Turn the bike off. Put it on a stable stand with the engine upright and level.
  • Clean the engine area around the drain plug to prevent debris from contaminating the fresh oil.

Step-by-Step Oil Change Process

1. Locate and Remove the Oil Drain Plug

  • On the 2019 GAS GAS TXT Racing 300, the drain plug is typically found underneath the engine, near the lowest point in the crankcase.
  • Use your metric socket and wrench to loosen the drain plug carefully.
  • Place the oil drain pan directly underneath before fully removing the bolt.
  • Remove the plug and let the old oil fully drain. Be patient to ensure all oil and contaminants escape.

2. Inspect and Replace Drain Plug Washer

  • Inspect the crush washer on the drain plug–replace it if damaged or worn to ensure a proper seal on reinstallation.

3. Reinstall the Drain Plug

  • Wipe the drain plug clean and reinsert it by hand to avoid cross-threading.
  • Use your torque wrench to tighten the plug to manufacturer spec. GAS GAS recommends approximately 23.5 to 25.5 Nm for TXT models from similar years. Do not overtighten–the threads are soft and can strip easily.
    “Screw the plug with a tightening torque of 23.5 ÷ 25.5 Nm”

4. Add New Oil

  • Locate the oil fill cap (typically on top of the right side of the engine).
  • Insert a clean funnel and pour in the recommended transmission oil or specialist gear oil. While options vary, Gro Gear Oil or another top-quality specialist oil is suggested by experienced owners

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  • Check your owner’s manual for the exact oil capacity, but typically the TXT Racing engine takes about 400 mL (0.4L) of transmission oil. Pour slowly to avoid overfilling.
  • Replace and tighten the oil fill cap securely.

5. Check for Leaks and Oil Level

  • Wipe the engine area to remove any spilled oil.
  • Start the bike and run it for a minute. Inspect the drain plug and oil fill cap for leaks.
  • Stop the engine and allow the oil to settle for several minutes.
  • Check the oil level again (using the sight glass, dipstick, or inspection port–refer to your manual if unsure). Top up if necessary.

Cleanup and Disposal

  • Dispose of used oil responsibly at your local recycling center or automotive parts store.
  • Clean all tools and work area.

Model-Specific Tips for the 2019 GAS GAS TXT Racing 300

  • Oil type matters: Owners often use specialist gear oils for trials bikes like the TXT 300, as the clutch and transmission share the same oil compartment. Consult your manual; Gro brand is favored among enthusiasts

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  • Thread care: Do not overtighten bolts. Strip-outs on drain plugs are a common issue due to relatively soft case metals

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  • Oil interval: For light-duty/trials use, oil changes are recommended more often than 4000 miles (about 6000 km). Many do it every 10–20 hours of riding for optimal clutch and gearbox feel

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  • Cleanliness: Ensure the drain bolt and area are free of dirt to avoid contamination–especially important in the dusty, muddy environments trials bikes often face

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Conclusion

Changing the oil in your 2019 GAS GAS TXT Racing 300 is a straightforward yet crucial task. By following these steps, using the correct tools and oil, and following the model-specific precautions, you’ll ensure superior performance and longevity for your trials bike—on behalf of MotoSport.com, happy riding and wrenching.

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Shop Tools for a 2019 GAS GAS TXT RACING 300 Dirt Bike.

Shop Oil Fillers and Drain Plugs for a 2019 GAS GAS TXT RACING 300 Dirt Bike.

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.