How to Change the Oil in a 2010 GAS GAS TXT PRO 300

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Keeping your 2010 GAS GAS TXT PRO 300 performing at its best requires regular gear oil changes. This expert MotoSport.com how-to blog guides you—step-by-step—through a robust, model-specific oil change. Attention is given to essential tools, detailed procedures, and call-outs unique to this trials bike. Regular oil changes reduce premature wear and ensure clutch and transmission reliability.

Tools & Supplies Needed

  • New gear oil: Use a high-quality specialist gear oil, such as GRO or a similar 75W gear oil formulated for trials motorcycles.
  • Basic metric socket or spanner set (usually 13mm–15mm for drain bolt, but verify the bolt size for your specific bike)
  • Torque wrench (capable of 23–26 Nm)
  • Rag/cleaning cloths
  • Oil drain pan/tray
  • Small funnel
  • Gloves (recommended)
  • New crush washer (if required for drain bolt)

Preparation

  • Warm up the engine for 2–3 minutes to help suspend contaminants and thin the oil, ensuring a complete drain.
  • Turn off the bike and place it upright (use a stand if possible) on a level surface.
  • Clean around the drain plug with a rag to prevent dirt from entering the gearbox.

Steps for Changing the Oil

  1. Locate the Drain Bolt
    • The drain plug is located underneath the right side of the engine. Reference your owner’s manual if unsure—on trials bikes, it’s often behind the bash plate.
    • Remove the bash plate if necessary.
  2. Remove the Drain Plug
    • Place the oil drain pan directly below the plug.
    • Use the correct size spanner or socket; loosen the bolt slowly.
    • Be cautious—oil may flow out quickly. Allow all old oil to drain completely, which may take several minutes.
    • Check the drain bolt for metal particles—a small amount is normal (the plug is magnetic), but larger chunks could indicate problems.
  3. Inspect, Clean and Reinstall Drain Plug
    • Clean the plug (especially the magnet) with a rag.
    • Replace the crush washer if it is flattened or damaged.
    • Reinstall the drain bolt. Do NOT overtighten. The recommended torque setting is 23.5–25.5 Nm. Use a torque wrench to avoid stripping threads, as these cases are soft alloy and over-tightening is a common owner mistake.
  4. Fill with New Gear Oil
    • Locate the oil fill cap on top of the engine case (typically on the right).
    • Remove the cap and, using a clean funnel, pour in the manufacturer-specified amount of oil: approximately 400cc (0.4L) for a 2010 TXT PRO 300. Always check your owner’s manual or the stamped marking near the fill point for the correct quantity specific to your machine.
    • Be careful not to overfill. It's easier to add oil than to remove excess.
    • Reinstall the fill cap securely.
  5. Finish Up and Inspect
    • Start the engine and let it idle for a minute, ensuring oil circulates through the transmission.
    • Turn off the bike, set it upright, and inspect for leaks around the drain and fill plugs.
    • Check for correct oil level using the inspection window or dipstick, if equipped—top up if necessary.

Special Call-Outs for the 2010 GAS GAS TXT PRO 300

  • Drain plug threads are easily stripped if overtightened—always use a torque wrench set between 23.5–25.5 Nm.
  • Trials bikes like the TXT PRO 300 separate engine and transmission oil, so use gear oil only in the gearbox—do not use engine oil here.
  • Magnetic drain plugs help catch normal gear wear particles. Excessive or large metal fragments may signal clutch or gear problems requiring inspection.
  • A small funnel makes refilling much easier—fill port is inconveniently placed and easily leads to spills if a funnel isn’t used.
  • The recommended oil change interval for trial riding conditions is typically every 20–30 hours or after any major deep water submersion.

Disposal and Environmental Tips

  • Always dispose of used oil responsibly—deliver to a recycling center or auto parts store. Do not pour oil on the ground.

Final Notes

  • After riding, re-check for leaks as vibrations can loosen bolts.
  • Follow the above procedures each time, and your GAS GAS TXT PRO 300 will deliver reliable, low-maintenance fun on the competition course or in the most demanding practice sessions.

For premium oils, filters, tools and all your OEM GAS GAS parts, visit MotoSport.com—the trusted source for all motorcycle needs.

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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.