How to Change the Oil in a 2007 GAS GAS TXT PRO 280

Shop parts for a 2007 GAS GAS TXT PRO 280 Dirt Bike.

Welcome to MotoSport.com's step-by-step guide on changing the oil in your 2007 GAS GAS TXT PRO 280. Keeping your bike's oil fresh is essential for optimal performance and longevity. This guide covers all the tools you'll need, every procedure step, and special notes specific to the TXT PRO 280 model.

Tools and Supplies Needed

  • 10mm and 13mm socket or spanner (verify bolt size as they may vary with wear or aftermarket changes)
  • Socket wrench
  • Drain pan
  • Funnel
  • Clean shop rags
  • New transmission/gear oil (such as GRO Gear Oil or another high-quality 75W gear oil; capacity: ~0.42 quarts / 0.4 liters)
  • Replacement crush washer for the drain bolt (recommended)
  • Safety gloves
  • Parts cleaner or degreaser (if needed)

Preparation

  • Warm up the engine by running it for a few minutes; warm oil will flow out more easily and suspend more contaminants.
  • Place the bike upright on a stable stand for easy access and to ensure proper draining.
  • Clean the exterior of the engine, especially around the oil drain plug and fill cap, to prevent dirt from entering the engine.

Steps to Change the Oil

  1. Locate the oil drain bolt. It is situated at the bottom of the transmission case. Place your drain pan beneath it.
  2. Loosen and remove the drain bolt (typically 10mm or 13mm). Allow the oil to fully drain. Tip: If the bolt is too tight or your tools slip, confirm you're using the correct size to avoid rounding the bolt.
  3. Inspect the draining oil for any metallic shavings or contaminations. This can indicate excessive gearbox wear.
  4. Clean and inspect the drain bolt. If it has a magnetic tip, remove any trapped metal debris. Replace the crush washer if it looks deformed or worn, as this helps to prevent future leaks.
  5. Reinstall the drain bolt using your fingers first to avoid cross-threading, then tighten snugly with a wrench. Do not over-tighten. The cases are soft aluminum, and over-torquing can strip the threads. Aim for firm, but not excessive, tightness.
  6. Remove the gear oil fill plug (located on the right side of the engine). Insert a funnel so oil is poured cleanly into the transmission.
  7. Pour new gear oil into the transmission. The 2007 TXT PRO 280 takes approximately 0.42 quarts (0.4 liters) of oil. Use your preferred high-quality gear oil, such as GRO Gear Oil. Some riders also use other specialist 75W gear oils for trials bikes.
  8. Replace and hand-tighten the oil fill plug.
  9. Wipe off any spills or drips and visually check for leaks around both the drain and fill plugs.
  10. Start the engine and let it idle for a minute, then shut off and check for any new leaks. Re-check oil level if your model has an inspection window or check screw.

Specific Call-Outs for the 2007 GAS GAS TXT PRO 280

  • This bike features a two-stroke engine with a separate gearbox/transmission oil circuit—meaning you only change the oil for the transmission, not the engine (the engine's lubrication comes from the oil/petrol fuel mix, typically 1.5% or around 67:1 ratio).
  • Do not overtighten the drain or fill bolts: these cases are known to be soft and prone to stripping if over-tightened. Use only as much force as necessary to seat the bolt with its washer in place.
  • Recommended oil type is a high-quality gear oil; the community favors GRO brand or Motul Transoil Expert 10W-40, but 75W gear oil is popular. Always avoid engine-specific oils (formulated for four-strokes) and opt for gear oil intended for wet clutches and gearboxes.
  • Oil can appear dark quickly–frequent changes ensure clutch and shifting performance remain sharp for trials bikes subject to heavy clutch use.
  • Capacity is low (0.42 quarts/0.4 liters); do not overfill. Overfilling can lead to clutch drag and leaks.
  • No engine oil filter is fitted on these models, so periodic oil changes are even more crucial to remove debris and maintain component life.

Additional Tips

  • Consider replacing the transmission oil every 15-20 hours of ride time, or more often if riding in muddy or wet conditions.
  • Keep a record of oil change dates/hours to track maintenance for best results.

With just a few tools and about 30 minutes, you can keep your 2007 GAS GAS TXT PRO 280 performing its best. Regular oil changes are one of the simplest and most effective ways to maintain your trials bike's reliability and performance.

Ride safe from the MotoSport.com team.

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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.