How to Change the Oil in a 2020 GAS GAS TXT RACING 125

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Changing the oil on your 2020 GAS GAS TXT RACING 125 is a critical maintenance task that ensures the longevity and smooth operation of your dirt bike. As a trials-focused two-stroke machine, the TXT Racing 125 uses a wet, clutch-friendly gearbox oil. This step-by-step guide, proprietary to MotoSport.com, walks you through the process with specific tips for this model.

Tools and Supplies Needed

  • New gearbox oil (at least 0.42 quarts, wet-clutch compatible, semi-synthetic or full synthetic, such as ATF Type F or a motorcycle-specific gear oil)
  • 8mm or 10mm socket or wrench (verify with your owner's manual for your specific drain bolt size)
  • Oil drain pan
  • Funnel
  • Clean rags
  • Rubber gloves
  • Torque wrench (recommended)
  • Replacement drain bolt washer (optional but recommended)
  • Oil syringe or measuring cup

Preparation

  • Start the engine and let it idle for a minute or two. This warms up the oil, allowing it to drain more easily and removing suspended debris.
  • Switch off the bike and secure it on a stand so it is upright and stable.
  • Put on gloves to protect your hands from hot oil.

Step-by-Step Oil Change Process

  1. Locate the Oil Drain Bolt
    • The drain bolt on the TXT 125 is generally at the bottom of the right side engine case. Double-check with your user manual to confirm its location.
  2. Remove the Oil Fill Cap
    • Remove the gearbox oil fill cap on the right-side engine case or on top of the clutch cover. This helps the oil drain faster.
  3. Position the Drain Pan
    • Slide the drain pan underneath the engine to catch the old oil.
  4. Remove the Drain Bolt and Drain Old Oil
    • Use the correct socket to remove the drain bolt. Let the oil completely drain into the pan.
    • Inspect the oil for any metal shavings or debris, which could indicate engine or gearbox wear.
  5. Inspect and Clean the Drain Bolt
    • Clean the drain bolt; many models have a magnetic tip to catch metal particles. Wipe off any debris.
    • If provided, replace the crush washer or gasket to prevent leaks.
  6. Reinstall the Drain Bolt
    • Reinstall the drain bolt and washer, if replaced. Tighten by hand initially, then use a torque wrench to tighten to manufacturer's specification (refer to your owner's manual).
  7. Add New Oil
    • Using a funnel, pour in the new oil. The typical capacity is 0.42 quarts (about 400 ml) for the TXT 125 gearboxes. Do not overfill.
    • Use a measuring cup or oil syringe for accuracy.
  8. Install the Oil Fill Cap
    • Replace the fill cap and tighten securely by hand.
  9. Check for Leaks
    • Start the engine and let it idle for a minute. Shut it off and inspect around the drain bolt for any leaks.
  10. Dispose of Used Oil Properly
    • Transfer the old oil from the pan to a sealed container and bring it to a recycling center or authorized disposal location.

2020 GAS GAS TXT RACING 125 Model-Specific Tips

  • This model uses a traditional trials two-stroke gearbox. While many kinds of oil are compatible, choose a wet-clutch compatible oil and never use motor oils with friction modifiers that can cause clutch slippage or accelerated wear. ATF Type F is a popular budget option; higher-end full synthetics can increase performance and lifespan if you ride in extreme conditions or demand maximum clutch performance.
  • Monitor your oil color and quality. For harsh or frequent riding, change oil more frequently to keep the gearbox in premium condition.
  • If your TXT 125 is used in muddy or wet conditions, consider shortening your oil change interval for extra protection.
  • Use an oil syringe with rubber tubing to quickly and cleanly fill the gearbox to precise levels, which is a common practice among trials bike owners.

Note on Maintenance Intervals

  • Many trials riders change their oil based on how dirty it appears rather than strictly following the hour/mileage guidelines. As a general rule, changing your gearbox oil every 10-15 hours of riding or at least once per month is a good baseline for this model.

Final Checks & Best Practices

  • Keep a log of oil changes including oil type, quantity, and intervals for optimal engine life.
  • When in doubt, consult your authorized GAS GAS dealer or reference the owner's manual for torque specs, approved oil types, and any other model-specific instructions.
  • Always use new oil from a sealed container to ensure no contamination.
  • Let the oil dictate your maintenance schedule: if it looks dirty, milky, or contaminated, change it sooner rather than later.

If you keep up with regular oil changes using these steps and high-quality products from MotoSport.com, your 2020 GAS GAS TXT RACING 125 will stay in top condition to tackle any section or trail with confidence.

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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.