How to Change the Oil on a 2023 GAS GAS TXT RACING 250

Shop parts for a 2023 GAS GAS TXT RACING 250 Dirt Bike.

Changing the transmission oil in your 2023 GAS GAS TXT RACING 250 is an essential part of routine maintenance to ensure long engine and clutch life. The TXT RACING 250 uses a two-stroke engine that relies on premixed fuel for combustion (not an oil-injected four-stroke) and a separate gear oil for its transmission. Here's a comprehensive MotoSport.com guide to help you do it right, with specific callouts for your GAS GAS.

Tools and Supplies Needed

  • 8mm and 13mm socket or spanner (to remove skid plate and drain plug)
  • Measuring cup (for precise oil fill)
  • Drain pan
  • Rags or shop towels
  • Contact cleaner or brake cleaner (optional, for cleaning up spilled oil)
  • Funnel (optional, for easier filling)
  • New gear/transmission oil (see specific recommendations below)
  • Crush washer (inspect and replace if necessary)
  • Torque wrench (recommended for correct spec)
  • Phillips screwdriver (for oil fill plug)

Transmission Oil Specification for GAS GAS TXT RACING 250

  • Gear Oil Type: Specialist transmission/gear oil, 75W light gear oil is widely used and recommended by experts. Brands like GRO or similar are preferred for trials transmissions.
  • Capacity: Typically around 400–450 ml. Always check your owner's manual or look for the oil sight glass to confirm your specific fill level.

Step-by-Step Oil Change Process

  1. Warm Up the Engine
    • Start the bike and let it idle for about 2–3 minutes. This helps the oil flow more easily when draining and ensures contaminants are suspended.
  2. Stand the Bike Upright
    • Turn off the engine and position the bike vertically, using a bike stand if available. Make sure the bike is secure.
  3. Remove the Skid Plate
    • If equipped, use your 8mm socket to remove the skid plate for easier access to the drain plug.
  4. Locate and Remove the Transmission Drain Plug
    • The drain plug is found under the engine. Place your drain pan below it and use a 13mm spanner or socket to carefully loosen and remove it.
  5. Drain the Old Oil
    • Wait several minutes for the oil to fully drain. Tilt the bike slightly side to side to maximize drainage. Inspect the old oil for large metallic particles (a little fine residue is normal).
  6. Inspect and Clean the Drain Plug
    • Wipe off the magnetic drain plug. Replace the crush washer if worn or damaged, to prevent leaks.
  7. Reinstall the Drain Plug
    • Hand-thread the plug in, then tighten snugly but avoid overtightening. If you have a torque wrench, tighten to the spec in your service manual (typically around 10–15 Nm for these bikes).
  8. Remove the Oil Fill Plug
    • The oil fill plug is located on the right side of the engine cover. Remove it using a Phillips screwdriver or socket.
  9. Add Fresh Gear Oil
    • Using a funnel or measuring cup, pour in the recommended amount of oil (400–450 ml). The sight glass on the engine case should show the oil level between the marks; do not overfill.
    • Use the gear oil recommended in your manual or by top aftermarket brands. For trials bikes, a thinner gear oil ensures better clutch action.
  10. Reinstall the Fill Plug
    • Install and snug up the fill plug. Wipe any spilled oil off the engine case.
  11. Check for Leaks and Final Inspection
    • Start the engine, let it idle for about a minute, and then shut it down. Re-check the oil level and the drain plug area for any signs of leaks.
    • Reinstall the skid plate if you removed it earlier.

Important 2023 GAS GAS TXT RACING 250 Model-Specific Callouts

  • This bike does NOT use motor oil in the crankcase for combustion. Use only the recommended premix two-stroke oil in your fuel at the stated ratio (commonly 1.5% or 67:1 for GAS GAS trials engines).
  • The oil you are changing is gear/transmission oil, not engine oil as with a four-stroke.
  • Avoid overtightening the drain plug—these cases are soft and prone to stripping if over-torqued.
  • Top European brands of trials-specific transmission oil offer the best clutch feel for competitive riding. Avoid using heavy or standard engine oil.
  • This process is similar for TXT models from 2018 to present, but always check for running engineering changes in seal and washer size, and confirm fill capacity with your manual.

Tip: Oil Change Interval

  • Oil changes are recommended every 10–15 hours of use or after every few long riding sessions, especially in competition or adverse conditions.

Final Thoughts from MotoSport.com

  • Regular gear oil changes on your GAS GAS TXT RACING 250 keep shifting smooth and extend clutch life.
  • Only use high-quality, purpose-specific transmission oil, and always measure and refill accurately.
  • If you notice milky oil or any water in your transmission case, investigate the water pump seal immediately.

Keep your 2023 GAS GAS TXT RACING 250 running smooth and reliable with routine maintenance from MotoSport.com. Got a question about parts or oil brands? Contact our team for expert dirt bike advice.

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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.