How to Change the Oil in a 2020 GAS GAS TXT RACING 250

Shop parts for a 2020 GAS GAS TXT Racing 250 Dirt Bike.

Changing the engine oil in your 2020 GAS GAS TXT Racing 250 is a crucial part of regular maintenance to ensure maximum engine longevity, smooth performance, and hassle-free riding. This guide from MotoSport.com walks you through the entire process, including specific details and call-outs unique to this model and year.

Tools and Supplies Needed

  • Metric socket set (ensure you have the correct size for the drain bolt – typically 13mm or 14mm, but double-check for your year/model)
  • Open-ended wrench or spanner (correct size for oil drain plug)
  • Drain pan to catch spent oil
  • Contact cleaner/degreaser to tidy up any mess
  • Paper towels or clean shop rags
  • New engine/transmission oil – consult your owner's manual for specification and capacity (most owners prefer fully synthetic or high-grade specialist gear oils)
  • New crush washer for drain bolt (recommended replacement each time)
  • Small funnel for easy filling
  • Measuring cup (for precise oil amount)
  • Latex/nitrile gloves (optional, but keeps your hands clean)

Model-Specific Call-Outs for the 2020 GAS GAS TXT Racing 250

  • Transmission oil should be changed every 30 hours, or sooner under heavy use or harsh conditions. The service manual recommends a warm-up prior to draining for thorough oil removal

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  • Do not over-tighten the drain bolt. The case material is soft aluminum—stripping is a common and costly mistake on GasGas trial bikes

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  • Check for debris or metallic shavings in drained oil: some residue is normal, but excessive particles may indicate wear.
  • Always use the correct grade and quantity of gear oil. Using engine oil not rated for wet clutch operation can cause clutch or shifting problems.

Step-by-Step Guide

  1. Preparation
    • Start the bike and let it idle for about 3-5 minutes. This warms the oil and makes it flow out more easily, ensuring a more complete drain

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    • Place the motorcycle on a stable, flat surface using the kickstand or a stand. Make sure the engine is off with the kill switch engaged and key removed.
    • Gather all your tools, oil, rags, and drain pan before starting.
  2. Locate and Remove the Drain Bolt
    • Locate the oil drain bolt beneath the right side of the engine case (refer to your manual for the exact position; it is typically the lowest bolt on the right engine case cover).
    • Position your drain pan beneath the drain plug.
    • Using the correct size spanner or socket, carefully loosen and remove the drain plug. Watch for hot oil.
    • Remove the crush washer and set aside for replacement.
  3. Drain the Old Oil
    • Allow the oil to fully drain. Tilt the bike gently from side to side to encourage all oil to escape.
    • If equipped, check any magnetic drain plug for excess metal filings and wipe it clean.
  4. Replace the Plug and Washer
    • Install a new crush washer onto the drain bolt.
    • Thread the bolt into the case by hand to avoid cross-threading.
    • Tighten the drain plug until it is snug, but not over-tightened. The aluminum threading is easily damaged—refer to your service manual for torque specs if available. A good rule: tighten gently until resistance, then a slight firm nudge (about 10-12 Nm if using a torque wrench)

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  5. Add Fresh Oil
    • Locate the oil fill cap (usually on the top right of the engine case).
    • Remove the fill cap, insert your funnel, and pour in the specified amount and type of new oil.
    • For the TXT Racing 250, use a quality motorcycle gearbox/transmission oil. Check your owner's manual for exact oil volume (typically near the 400cc mark, but always verify for your year).
    • Wait a moment for the oil to settle, then check the level using the oil sight glass or dipstick, if equipped.
  6. Finishing Touches
    • Reinstall the oil fill cap.
    • Start the engine and let it idle for a minute. Shut off, wait a few moments, and re-check oil level; top off if necessary.
    • Inspect the drain area for any leaks. If you spot drips, double-check plug tightness and washer placement.
    • Wipe away any spills and dispose of used oil responsibly according to local regulations.

Pro Tips for the 2020 GAS GAS TXT Racing 250

  • If you ride in wet, muddy, or dusty conditions, consider changing your oil more frequently than the base 30-hour interval.
  • Check and clean your air filter after an oil change for comprehensive maintenance.
  • Keep a log of oil changes—including brand, specs, and mileage/hours—for optimal bike care and resale value.
  • Be cautious with fasteners. The engine cases and drain bolt are soft alloy; avoid impact tools and always start threading bolts by hand to prevent cross-threading.

For more model-specific advice, official parts, and premium oils for your 2020 GAS GAS TXT Racing 250, trust MotoSport.com. We’re your partner in everything dirt bike maintenance.

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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.