How to Change the Oil in a 2024 GAS GAS TXT GP 250

Shop parts for a 2024 GAS GAS TXT GP 250 Dirt Bike.

Keeping your 2024 GAS GAS TXT GP 250 in top shape means making regular oil changes part of your maintenance schedule. This guide is proprietary to MotoSport.com and covers the complete oil change process specifically for your TXT trials bike, including unique call-outs for the 2024 model. Follow these steps to ensure smooth operation and long engine life.

Tools and Supplies Needed

  • 8mm or 10mm spanner (double check size for drain bolt–earlier TXT models use 8mm, but confirm for 2024)
  • Oil drain pan
  • Clean rags
  • New oil (consult your owner's manual for the precise grade–many owners recommend a synthetic 75W or 80W gear oil for the transmission; typically around 500ml/0.53qts)
  • Funnel
  • Measuring cup
  • Replacement crush washer (recommended, not always required)
  • Contact cleaner (for cleaning surfaces)
  • Latex or nitrile gloves (optional, for less mess)

Pre-Service Tips and 2024 Model Callouts

  • The 2024 GAS GAS TXT GP 250 closely follows traditional trials bike designs with a two-stroke engine using separate gear oil. It does not use a cartridge-style oil filter like some four-stroke models–oil changes are about draining and refilling the transmission side.
  • Always work on a clean, cool bike. If you've just ridden, allow the engine to cool to prevent burns and to let oil settle back into the gearbox.
  • Check the owner's manual for proper oil quantity and recommended oil type to avoid clutch slipping or accelerated wear. Overfilling or underfilling can affect shifting and clutch feel.

Step-By-Step Oil Change Instructions

  1. Prepare the Motorcycle
    Place the TXT GP 250 upright on a stable stand. If possible, rinse off excessive dirt, especially around the drain bolt and fill cap to prevent contamination.
  2. Locate Oil Drain Bolt
    On the right side of the engine case (lower area), you will find the oil drain bolt (typically 8mm on TXT models, but confirm for 2024). Double check under the engine for a small hex bolt near the lowest part of the clutch/transmission case.
  3. Place Drain Pan
    Slide your oil drain pan directly beneath the drain bolt.
  4. Remove Filler Cap
    Unscrew the oil fill cap from the top of the case. This allows air in and lets oil drain smoothly.
  5. Remove the Drain Bolt
    Use your spanner or socket to loosen and remove the drain bolt. Let the oil drain completely. Inspect the old oil for any metallic glitter or signs of contamination.
  6. Inspect/Replace Crush Washer
    Once oil is fully drained, inspect the crush washer on the drain bolt. Replace if crushed flat or damaged to prevent leaks.
  7. Clean and Reinstall Drain Bolt
    Wipe the drain area and threads clean. Reinstall and snug the drain bolt—do NOT overtighten. Many cases strip easily; only use hand-tight plus a small turn (typically around 10Nm/7.5ft-lbs–confirm with your manual).
    2024 TXT GP 250 owners: Many cases have been stripped due to overtightening—snug, not tight.
  8. Refill with New Oil
    Using a funnel and measuring cup, pour in the manufacturer's specified amount. For the TXT GP series, this is typically around 500ml (or as marked on the clutch cover). Ensure you use the recommended oil type–most owners use Motorex, GRO, or similar high-quality synthetic gear/transmission oil.
    Using the right oil weight and quality is critical for proper clutch feel in trials riding.
  9. Reinstall Filler Cap
    Wipe off any spilled oil and screw the filler cap back on securely.
  10. Wipe Off, Check for Leaks, and Dispose of Old Oil
    Run a rag around the case. With the bike upright, check for drips or leaks around the drain bolt and filler cap.
    Take your used oil to a recycling center or automotive shop for proper disposal.
  11. Start & Check Level
    Start the bike, let it idle for a few moments, then shut off and re-check the level per the sight glass or dipstick (if applicable). Top off if needed.

Important Model-Specific Callouts for the 2024 GAS GAS TXT GP 250

  • The 2024 TXT GP series continues with the same gear oil setup as previous trials models—there is no disposable oil filter.
  • Be gentle with all case bolts and threads. The clutch side case is known for stripping if overtightened.
  • If your bike has a magnetic drain plug, inspect for metallic particles–significant buildup may indicate impending transmission issues.
  • Do not use automotive engine oil in the gearbox–only dedicated gear oil, as friction modifiers in engine oil can negatively affect clutch disks.
  • Torque specs and oil capacity may change slightly year-on-year–always confirm specs with your official GAS GAS manual.
  • If in doubt about oil, many trials riders recommend GRO Gear Oil 75W for smooth clutch engagement.

Pro Tips

  • Change the oil every 15-25 hours of use for peak clutch and transmission life, or more often in wet/muddy conditions.
  • Keep the filler and drain areas clean and free of grit before starting. Contaminants are a common cause of internal wear.
  • Always check your manual for specifics about oil quantity and tightening torque.

If you have any doubts or discover stripped threads or persistent leaks, consult a qualified GAS GAS dealer or expert. Routine oil changes will keep your 2024 TXT GP 250 performing flawlessly on the trials course.

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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.