How to Change the Oil in a 2021 GAS GAS TXT RACING 250

Shop parts for a 2021 GAS GAS TXT RACING 250 Dirt Bike.

Changing the oil in your 2021 GAS GAS TXT RACING 250 is essential routine maintenance to ensure long-term reliability and top performance on the trails. If you’ve never changed the oil on this trials bike, this detailed guide—proprietary to MotoSport.com—will walk you through every step, from gathering tools to adding fresh oil, along with model-specific notes every owner should know.

Tools and Materials Needed

  • 8mm and 13mm socket or spanner (for drain bolt and filler cap)
  • Drain pan
  • Measuring cup (for precise oil refill)
  • Clean rag or shop towels
  • Parts cleaner/contact cleaner (optional, for cleaning up oil residue)
  • New crush washer (recommended)
  • Fresh gear oil (see below)
  • Torque wrench (recommended for reinstalling bolts)
  • Small funnel (optional, for easy pouring)

Recommended Oil and Capacity

  • Gear oil:– High-quality 75W or 80W motorcycle gear oil (synthetic preferred for longevity and performance)
  • Oil capacity: Approximately 0.42 quarts (roughly 400ml) for TXT 250/300 models. Always check your owner’s manual to confirm the exact capacity for your specific year and model.
    Note: Overfilling or underfilling can compromise clutch function and engine life.

Step-by-Step Oil Change Process

  1. Warm Up the Engine
    Start your bike and let it idle for a few minutes. Warm oil drains more easily, carrying away more contaminants. Do not attempt this procedure on a hot bike to avoid burns.
  2. Position the Bike
    Place the bike upright on a stand or level surface. A stand makes it easier to access the drain bolt and keep the bike steady.
  3. Clean Around the Drain Plug
    Wipe any dirt or debris from the drain plug and filler cap area with a clean rag to prevent contaminants from entering your engine during the oil change.
  4. Remove the Oil Filler Cap
    Using your fingers or a wrench (if tightened), loosen and remove the oil filler cap (usually located on the right side crankcase cover). Set it aside someplace clean.
  5. Drain the Old Oil
    Place a drain pan directly under the engine. With your 13mm socket or spanner, remove the oil drain bolt at the bottom of the engine. Allow all oil to drain out; this can take several minutes.
    Tip: Tilt the bike gently side-to-side to ensure complete drainage.
  6. Inspect and Replace Crush Washer
    Inspect the crush washer on the oil drain bolt. If it appears damaged or deformed, replace it to ensure a proper seal and prevent leaks.
  7. Reinstall the Drain Bolt
    Clean the drain bolt and area, wipe off any remaining old oil. Reinstall the bolt by hand to avoid cross-threading, then snug it with your spanner or socket. Do not overtighten–snug plus a quarter turn is enough. Many stripped drain plugs happen from overtightening. If using a torque wrench, refer to the manual for the correct spec (usually around 10-12 Nm).
  8. Add New Oil
    Place a funnel into the oil fill hole, and slowly pour in the recommended amount (about 400ml). Reference your measuring cup to avoid overfilling. Most owners find between 375-425ml correct but use the inspection window or dipstick to confirm mid-line level.
    • Different oil brands deliver varying levels of clutch feel. Many owners prefer top European brands or full synthetic formulas for improved shifting.
  9. Install Filler Cap
    Once the correct amount of oil is in, reinstall the oil filler cap and tighten by hand.
  10. Start and Check for Leaks
    Start the bike and let it run for 1 minute. Shut it off, allow it to settle, then re-check the oil level and the area under the bike for leaks. Add a small amount of oil if needed.
  11. Dispose of Old Oil Properly
    Pour the used oil into a proper recycling container and dispose of it at your local hazardous waste facility or auto service center.

Model-Specific Tips for 2021 GAS GAS TXT RACING 250

  • Tight Space: Oil fill and drain locations can be tight. Use the correct size tools to prevent rounding off bolts.
  • Slow Drain Plug Removal: Allow time for drainage–gearbox oil is thicker than engine oil in most motorcycles.
  • Oil Choice and Clutch Feel: Wet clutch performance is sensitive to oil type. Synthetic 75W or 80W delivers optimal feel and durability.
  • Avoid Over-tightening: Both the fill and drain plugs thread into aluminum cases which are easily stripped if overtightened.
  • Wash Before Oil Change: Clean the exterior of your bike, especially near the fill and drain areas, to prevent unwanted grime entering the engine during service.
  • Maintenance Interval: GAS GAS TXT 250 models should have the oil changed every 15–20 hours of operation under normal trials use, or immediately if submerged in mud or water.

Final Thoughts & Safety Reminders

  • Always consult your owner’s manual for specifics on oil type, capacity, and torque specs for drain/fill bolts.
  • Never over-tighten aluminum plugs; use a torque wrench for security when possible.
  • Frequent oil changes are cheap insurance against costly transmission and clutch repairs.
  • This guide is proprietary content for MotoSport.com. For further reference, contact MotoSport for recommended maintenance kits and top-reviewed synthetic oils.

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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.