How to Change the Oil in a 2009 GAS GAS TXT PRO 250

Shop parts for a 2009 GAS GAS TXT PRO 250 Dirt Bike.

Changing the oil in your 2009 GAS GAS TXT PRO 250 is a key part of regular maintenance that ensures your dirt bike’s engine and gearbox function at their best. While the operation is straightforward, this specific trials bike has unique details you should know before you begin. This proprietary MotoSport.com guide covers tools, steps, and model-specific tips for a simple and clean oil change.

Tools and Materials Needed

  • Metric wrenches or sockets (commonly 8mm and 13mm, check your specific drain bolts and filler bolts)
  • Oil drain pan
  • Clean rags
  • Funnel
  • Replacement transmission/gear oil (see below for recommended type)
  • Crush washer (optional, but recommended to replace when removing the drain bolt)
  • Torque wrench (optional, but important for proper bolt installation)
  • Pliers (if an oil screen or filter is involved; the TXT PRO 250 uses an oil screen rather than a full filter)

Recommended Oil Type & Capacity for 2009 GAS GAS TXT PRO 250

  • Oil type: High-quality gear oil or transmission oil. NILS CLUTCH TRIAL is the factory recommendation, but other high-grade 75W synthetic gearbox or clutch oils are commonly used for trial bikes.
  • Oil capacity: 370cc (0.37 liters)

Step-by-Step Oil Change Process

  • Warm up the engine:–
    Start and run the bike for a few minutes. Warming up the oil helps it drain out more completely, taking debris with it.
  • Remove the skid plate (if equipped):–
    Some TXT PRO 250 models have skid plates that may block access to the drain plug. Remove if necessary.
  • Position the bike and oil pan:–
    Place your bike upright and level, or use a suitable bike stand. Slide the oil pan underneath the transmission drain plug, located under the engine.
  • Remove the oil filler cap:–
    On the right side of the engine, unscrew the oil filler cap or plug. This lets air in, helping oil drain smoothly.
  • Unscrew the drain bolt and drain the oil:–
    Using the correct size spanner or socket (usually 8mm or 13mm), loosen and remove the transmission drain plug. Let the old oil drain fully.
    Model call-out:– The drain bolt on the TXT PRO 250 can be delicate—avoid overtightening when reinstalling to prevent stripping the threads. Only snug the bolt, do not overtighten.
    Inspect the drain bolt for any shavings or debris, and clean the area well with a rag before reinstalling.
  • Clean oil screen (if equipped):–
    Some TXT PROs have a small screen filter inside the drain plug hole. If present, remove, clean with solvent or degreaser, inspect for debris, and replace.
  • Replace the crush washer (recommended):–
    If your drain plug uses a crush washer, install a new one to prevent leaks.
  • Reinstall the drain bolt:–
    Hand-thread the drain bolt to avoid cross-threading, then snug it using your wrench. If you have a torque wrench, tighten to manufacturer specs (typically not more than 10–15 Nm).
  • Add new oil:–
    Position a funnel in the oil filler hole and add 370cc (0.37 liters) of the recommended gear oil. Go slow to avoid overfilling.
  • Check oil level:–
    Some TXT PRO 250s have a sight glass or level bolt; otherwise, measure carefully before pouring.
    Do not overfill—the clutch will not perform well if there's too much oil.
  • Reinstall the oil filler plug:–
    Clean any dirt from the threads and replace the cap snugly. Do not overtighten.
  • Start the engine and check for leaks:–
    Let the bike idle for a few minutes, then look under the cases for any oil seepage around the drain and fill bolts. Address if necessary.
  • Dispose of old oil responsibly:–
    Take the used oil to a recycling center; don’t dump it down the drain or on the ground.

GAS GAS TXT PRO 250-Specific Notes & Tips

  • Don’t overtighten drain/fill bolts:– These engines use soft aluminum cases and overtightening can strip threads easily.
  • Oil selection affects clutch feel:– Trials riders sometimes experiment with different oils for optimal clutch performance. Gearbox oils labeled for wet clutch compatibility typically work best.
  • Check for metallic particles:– Finding a small amount of metallic “fuzz” on the drain bolt magnet is normal, but chunks signal deeper problems and should be addressed.
  • Oil frequency:– Change the oil frequently in a trial bike—after every few hard rides or competition events is recommended.

Troubleshooting

  • Oil leak at drain plug:– Likely a damaged or missing crush washer, or overtightening. Always replace washer and torque properly.
  • Cloudy or milky oil:– Indicates water ingress—check gaskets and seals.
  • Stripped threads:– If threads are stripped, use a thread repair kit (helicoil) or consult a mechanic.

Final Checklist

  • Filler cap secure
  • Drain bolt snug with new washer
  • Oil level correct
  • No leaks after first run
  • Record date and hours for next change

Always consult your owner’s manual for official specifications if available.

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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.