How to Change the Oil in a 2011 GAS GAS TXT PRO 300

Shop parts for a 2011 GAS GAS TXT PRO 300 Dirt Bike.

Maintaining your 2011 GAS GAS TXT PRO 300 with regular oil changes ensures reliable performance and extends the life of your bike. This step-by-step guide is proprietary to MotoSport.com and walks you through the complete process, including tools, tips, and details specific to this year and model.

Tools and Supplies Needed

  • Socket set (commonly 8mm–13mm, check your drain bolt size first)
  • Box or open-ended spanner
  • Drain pan for used oil
  • Clean funnel
  • Rag or paper towels
  • Exact replacement gear/transmission oil (consult owner’s manual, commonly SAE 75W/80W or a gear oil designed for wet clutch applications)
  • Replacement crush washer for the drain bolt (recommended)
  • Torque wrench
  • Gloves (optional, but highly recommended)

Preparation Steps

  • Make sure the engine is off and motorcycle is on a secure, flat surface. For best results, change the oil when the bike is slightly warm—never hot—to help old oil drain but avoid burns.
  • If possible, wash the area around the drain bolt and filler before beginning to minimize the risk of contamination as suggested by experienced mechanics.

Step-by-Step Oil Change Process

  1. Locate the Drain Bolt:
    The oil drain bolt is on the bottom of the engine, easily accessible from beneath the bike. Place the drain pan directly underneath the bolt.
  2. Remove the Drain Bolt:
    Use the appropriate spanner or socket—ensure it is the correct size to avoid stripping the head. Turn counterclockwise to remove. Allow the old oil to fully drain out into your pan. Be patient; allow a few minutes for all oil to exit the crankcase.
    Specific tip: The 2011 GAS GAS TXT PRO 300 drain bolt may have a magnetic tip—inspect it for metallic debris, which is normal in tiny amounts but could indicate internal wear if excessive.
  3. Inspect and Clean the Drain Bolt:
    Wipe the bolt and threads clean with a rag. Replace the crush washer if it appears flattened or degraded.
  4. Reinstall the Drain Bolt:
    Screw the bolt back in by hand to ensure proper threading. Use a torque wrench to tighten it to the manufacturer’s specification (typically around 23.5–25.5 Nm for GasGas models, but confirm for your specific model).
    Do not over-tighten: Overtightening can strip the threads or crack the case.
  5. Locate and Open the Oil Fill Cap:
    The filler cap is usually on the right side of the engine. Remove the cap and set aside.
  6. Add Fresh Oil:
    Using a clean funnel, pour the manufacturer-specified amount of gear/transmission oil (typically 900ml for this generation). Add oil slowly to prevent spills.
    Call-out: The oil fill access is tight and tucked, so a small funnel is crucial to avoid a mess.
  7. Replace Oil Fill Cap:
    Wipe any excess oil, then reinstall the cap securely.
  8. Prime the Transmission:
    Before starting the engine, push the kick starter several times with the ignition off to circulate new oil through the gearbox. This coats internal gears and clutch plates.
  9. Check for Leaks:
    Examine the area around the drain bolt and filler cap for leaks. Correct as needed.
  10. Dispose of Used Oil Properly:
    Take used oil to a recycling facility or auto parts store that accepts waste oil.

Special Model-Specific Callouts

  • Oil Capacity: 900ml is typical for GAS GAS TXT engines of this generation, but check your manual to confirm for the 2011 PRO 300.
  • Drain Bolt Torque: Use 23.5 to 25.5 Nm torque for the drain bolt. Stripped threads are a common owner issue, so always use a torque wrench.
  • Transmission Oil Type: Best performance comes from a high-quality, wet clutch-compatible gear oil. Many GAS GAS owners prefer specialty gearbox oils formulated for trials bikes.
  • Access Tips: Filler location can be tricky. A small funnel and patience are key for spill-free oil additions. Consider checking your air filter while the side panel is off, as it’s an easy extra step.
  • Inspection: The drain plug magnet can show small metal flecks—this is normal engine wear. Large or excessive chunks may indicate problems and should prompt further inspection.

Final Checklist

  • Oil level correct and cap secure
  • No oil leaks at drain bolt or filler
  • Used oil disposed of responsibly
  • Area cleaned up and tools accounted for

Regular oil changes are vital for the longevity and smooth operation of your GAS GAS TXT PRO 300. For quality OEM parts, lubricants, and more model-specific how-tos, trust the experts at MotoSport.com.

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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.