How to Change the Oil in a 2014 GAS GAS TXT PRO 300: Step-by-Step Guide

Shop parts for a 2014 GAS GAS TXT PRO 300 Dirt Bike.

Changing the oil in your 2014 GAS GAS TXT PRO 300 dirt bike is vital for optimal performance and longevity. This guide, proprietary to MotoSport.com, walks you through the entire oil change process—highlighting the required tools, steps, and model-specific tips you need to ensure a smooth, mess-free maintenance routine.

Tools and Materials Needed

  • Socket wrench set (common drain plug sizes: 13mm or 14mm spanner)
  • Drain pan (for used oil collection)
  • Funnel (to prevent spills during refill)
  • Clean rags or shop towels
  • Torque wrench (set to 23.5 – 25.5 Nm for drain bolt)
  • New gear/transmission oil (high-quality; popular options include GRO special gear oil or a high-grade SAE 75W/80W transmission oil)
  • Gloves (optional, for cleanliness)

Preparation Steps

  • Start your bike and let it idle for 2-3 minutes. Warm oil drains faster and more thoroughly.
  • Turn off the engine and place the bike on a suitable stand, keeping it upright and stable throughout the process.
  • Ensure your work area is well-lit and ventilated.

Step-by-Step Oil Change Process

  • Locate and Remove the Drain Plug
    – Find the oil drain plug on the underside of the engine case.
    – Position the drain pan directly beneath the drain bolt.
    – Using the appropriately sized socket or spanner, carefully remove the drain bolt. Allow all oil to drain completely (let the bike sit for 5-10 minutes for best results).
  • Inspect and Clean the Drain Plug
    – Many GAS GAS drain bolts are magnetic; inspect for and remove any metallic debris or sludge. Small metallic "fuzz" is normal, but chunks indicate a problem.
    – Wipe the bolt threads and seating surface clean with a rag.
  • Replace Drain Plug
    – Thread the plug back into the engine case by hand to avoid cross-threading.
    – Using your torque wrench, tighten the drain bolt to 23.5–25.5 Nm (per GAS GAS manual recommendation for the TXT 300 series).
    – Do not over-tighten. Stripped threads or overtightened bolts can cause serious damage and oil leaks.
  • Fill with Fresh Oil
    – Remove the fill cap on the right side of the engine.
    – Use a funnel to avoid spilling oil on the engine or cases.
    – The correct oil volume is typically ~450 ml for the 300cc trials models (always consult your owner's manual or check existing oil sight glass if available for correct level). – Pour in the recommended oil slowly, pausing periodically to check the level if your bike is equipped with an oil site glass or dipstick.
    – Wipe away any oil drips or spills.
  • Reinstall the Fill Cap
    – Firmly tighten the fill cap by hand. Do not overtighten.
  • Double-Check for Leaks
    – With the bike still upright, visually inspect the drain and fill area for leaks. – Start the bike and let it idle for 1-2 minutes.
    – Shut it off and re-check drain bolt and fill cap for seepage.
  • Dispose of Old Oil Responsibly
    – Take your used oil to a proper recycling facility or hazardous waste handler.

2014 GAS GAS TXT PRO 300 Model-Specific Oil Change Tips

  • Drain Bolt Material: These are soft aluminum threads. Always use the proper-size tool and torque wrench—over-tightening is a common mistake and easily strips the threads.
  • Oil Recommendations: Owners commonly use high-quality synthetic or semi-synthetic gear/trans oils like GRO or Motul Transoil. The factory typically specifies a transmission or gear oil (not standard engine oil) in the range of SAE 75W/80W.
  • Drain Plug Access: The drain plug is located low and can be partially blocked by the skid plate. Remove or loosen the plate if necessary for easier access.
  • Oil Sight Glass: Some TXT PRO models use a sight glass on the right case. Fill until the level is at the indicated "full" mark with the bike upright and level.
  • Transmission Clutch Sensitivity: The 2014 TXT PRO 300 has a hydraulic clutch that is sensitive to oil choice. Using recommended oil helps maintain optimal clutch feel and engagement.
  • Residue and Debris: Always check the magnetic drain bolt for metallic shavings. "Fuzz" is normal, but chunks mean you should consult a mechanic.
  • Air Filter Check: Good practice to check/clean the air filter when changing oil for complete maintenance coverage.

Pro Tips for a Clean and Trouble-Free Oil Change

  • Keep everything clean. Dirt in the oil fill hole can quickly migrate to gears and clutches.
  • Always use a funnel for filling. The oil filler is small and awkward—spills are likely without one.
  • Dispose of waste oil properly—it is illegal and environmentally harmful to pour it down drains, onto soil, or in the trash.

Conclusion

Performing an oil change on your 2014 GAS GAS TXT PRO 300 is a straightforward process that protects your bike's performance and reliability. The correct tools, attention to proper torque, and the use of manufacturer-recommended oil are crucial. Regular oil changes (every 10–20 hours of use, or more frequently in harsh conditions) keep your TXT running strong, so you can focus on riding instead of repairs. For all your parts and maintenance needs, MotoSport.com is your trusted source for GAS GAS maintenance essentials.

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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.