How to Change the Oil in a 2013 GAS GAS TXT PRO 280

Shop parts for a 2013 GAS GAS TXT PRO 280 Dirt Bike.

Maintaining your dirt bike is key to performance, and one of the most important regular tasks is changing the gearbox oil (often referred to as transmission oil) in your 2013 GAS GAS TXT PRO 280. This guide, created exclusively for MotoSport.com, will walk you through the process step-by-step, including all necessary tools, model-specific notes, and expert tips to ensure your dirt bike runs at its best.

Tools and Materials Needed

  • Socket set (including metric sockets, typically 13mm or 17mm for drain bolt)
  • Ratcheting wrench or spanner of correct size
  • Flathead screwdriver
  • Measuring jug (with 10ml increments)
  • Drain pan
  • Clean rags
  • Funnel
  • Replacement gear oil (370cc/0.37L, recommended type: SAE 75W, high-quality motorcycle transmission oil)
  • Replacement crush washer (recommended, but optional)
  • Nitrile gloves (optional, for cleaner hands)

Important Model-Specific Notes

  • The 2013 GAS GAS TXT PRO 280 takes 370cc (0.37 liters) of transmission oil. Overfilling or underfilling can affect clutch performance and gearbox longevity.
  • Always read your owner's manual for any updates or changes to recommended specifications specific to your production batch. While the manual for similar models like the TXT Racing 280 in later years confirms these details, always double-check for your exact year just in case there's a manufacturer update.
  • Unlike four-stroke engines, this two-stroke uses its oil only for the gearbox—NOT for engine lubrication, so never attempt to run engine oil through the transmission or vice versa.
  • Let the engine run for a few minutes to warm up before draining; this helps suspended debris flow out and ensures a complete drain.

Step-by-Step Oil Change Instructions

  1. Preparation
    • Gather your supplies and tools and set your bike upright on a level surface, preferably using a stand for stability.
    • Let the engine run for 1-2 minutes or take a short spin; warm oil flows out more easily and removes more contaminants.
    • Allow the engine to cool slightly so the cases are warm but not hot to touch.
  2. Draining the Oil
    • Locate the gearbox drain bolt on the underside of the right crankcase (typically a 13mm or 17mm bolt).
    • Position a drain pan beneath the bolt to catch used oil.
    • Using the correct socket or spanner, loosen the drain bolt and carefully remove it.
    • Allow oil to drain thoroughly for several minutes. Use this time to check for metal shavings on the drain bolt magnet (if equipped)–some fine sediment is normal, but larger fragments indicate possible problems.
    • While the oil drains, inspect the condition of the crush washer on the drain bolt; replace it if there is flattening or visible wear.
  3. Reinstalling the Drain Bolt
    • Once oil flow has stopped, wipe the drain area with a clean rag.
    • Reinstall the drain bolt (with a new crush washer if available).
    • Screw in the bolt finger-tight at first, then carefully snug it up with your wrench. Do not overtighten. The crankcase threading is soft aluminum and can easily be stripped. Get it just tight enough for a good seal.
  4. Adding New Oil
    • Remove the gearbox oil filler cap, usually located on the right side of the engine near the clutch cover.
    • Place a clean funnel in the opening.
    • Measure 370cc of the recommended oil in your measuring jug.
    • Slowly pour the oil into the gearbox, ensuring there is no spillage. If any oil spills, wipe it up immediately.
    • Replace the filler cap, ensuring it is seated correctly and not cross-threaded.
  5. Final Checks and Cleanup
    • Wipe down the outside of the engine with a clean rag to remove any oil residue.
    • Start the bike and idle for 30 seconds.
    • Check for leaks around the drain bolt and filler cap. If leaking, tighten the suspect bolt or replace the crush washer if necessary.
    • Check oil level again if your model has a sight glass or level plug and top off if needed (avoid overfilling).
    • Dispose of old oil responsibly at an approved recycling center.

Tips and Recommendations

  • For best performance, change the oil every 15-20 hours of riding or after every race/long weekend of use.
  • Check oil color at every change. Milky coloration may indicate water contamination and should be investigated.
  • Stick to high-quality, motorcycle-specific gear oil; avoid automatic transmission fluid (ATF) unless explicitly recommended by your manual for clutch feel reasons.
  • Keep the work area and filler opening spotless. Even minimal dirt can cause gearbox damage over time.

Conclusion

Regularly changing your 2013 GAS GAS TXT PRO 280's gearbox oil is a fast, straightforward job that pays huge dividends in clutch feel, transmission life, and overall riding enjoyment. Each step in this guide ensures you get it done right, every time. MotoSport.com always recommends consulting your owner's manual and using only quality replacement parts for your GAS GAS. Ride safe and keep your machine in peak form.

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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.