How to Change the Oil in a 2009 GAS GAS TXT PRO 280

Shop Parts for a 2009 GAS GAS TXT PRO 280 Dirt Bike.

Keeping your 2009 GAS GAS TXT PRO 280 in top condition requires regular oil changes to ensure optimal clutch and transmission performance. Proper maintenance helps extend the life of critical components and keeps your bike running smoothly for every ride. The TXT PRO 280 is a trials bike with a unique oiling system, so following the correct procedure is essential. This guide, proprietary to MotoSport.com, will walk you through all the steps, highlight the specificities of the 2009 GAS GAS TXT PRO 280, and provide expert tips for a clean, efficient oil change.

Tools and Materials Needed

  • Socket wrench set (specifically, a 17mm or 19mm socket for the drain bolt)
  • Oil catch pan
  • Funnel
  • Clean rags
  • Flathead screwdriver
  • 370 cc of high-quality transmission oil (recommendation below)
  • Torque wrench (optional, but preferred for re-tightening the drain bolt)
  • Gloves (optional for cleanliness)

Recommended Oil Type and Capacity for 2009 GAS GAS TXT PRO 280

  • Transmission oil capacity: 370 cc
  • Recommended oil: NILS Clutch Trial or a high-quality 75W gear oil formulated for wet clutches. Make sure the oil meets the manufacturer's specification as indicated in the official reference manuals for similar models.

Step-by-Step Guide

1. Preparation

  • Let the bike run for five minutes to warm up the oil. Warm oil drains more thoroughly and carries particulates away from the sump.
  • Place the bike securely on a center or lift stand so it remains upright and stable during the whole service.
  • Clean the area around the drain bolt at the underside of the engine to prevent sand or grit from getting into the engine during oil draining.

2. Draining the Old Oil

  • Using the correct socket or spanner, carefully loosen and remove the oil drain bolt under the engine. The bolt is sometimes on the right side towards the bottom–take care, as the drain plug is shallow and can strip easily if overtightened during reinstallation.
  • Let all old oil completely drain into your catch pan. Allow at least five minutes for a thorough drain.
  • While waiting, check the copper or aluminum washer for damage or deformation. Replace if necessary to ensure a good, leak-free seal.

3. Reinstalling the Drain Bolt

  • Clean the drain bolt thoroughly with a rag.
  • Install a new washer if needed, and thread the drain bolt back into place by hand to avoid cross-threading.
  • Use a torque wrench, if available, and tighten to the specification (generally about 10 Nm for these bikes). Remember: Do not overtighten. Many owners have stripped this drain hole by using too much force. Snug, but not extreme.

4. Refilling with Fresh Oil

  • Locate and remove the oil fill cap (often located on the right crankcase cover).
  • Place a small funnel in the fill opening and slowly pour in 370 cc of fresh transmission oil. Pour slowly to avoid spills and overfilling.
  • Once filled, reinstall the fill cap and wipe any spills with a clean rag.

5. Final Checks

  • Start the engine and let it idle for about 60 seconds. Shift through all gears, then return to neutral and turn off the bike.
  • Wait a few minutes, then check around the drain bolt and oil fill area for leaks.
  • Dispose of old oil responsibly–never dump it on the ground or in household waste.

2009 GAS GAS TXT PRO 280 Specific Call-Outs

  • Oil Spec: This year/model uses the same transmission oil for the clutch and gearbox system. Do not use motor oil designed for 4-stroke engines. Only use oil recommended for 2-stroke transmissions with wet-clutch compatibility. NILS Clutch Trial and Gro Gear Oil have both been long-term favorites among trials riders for GAS GAS machines.
  • Capacity: Avoid overfilling–the correct amount is 370 cc. Overfilling may cause clutch drag and lever feel issues.
  • Drain Bolt Material: The drain bolthole is quite shallow in the case, so avoid overtightening to prevent costly thread damage.
  • No Oil Filter: The 2009 TXT PRO 280, like most trials bikes, does not have a replaceable oil filter. Thus, regular oil changes are the best way to protect the clutch and transmission.
  • Washer Inspection: Always check the sealing washer every oil change. A crushed or worn washer can cause leaks.

Helpful Tips

  • If the oil appears milky, it may indicate water ingress; investigate and repair before continuing to ride.
  • Changing the oil after particularly wet or dirty rides is a good idea, since trials bike transmissions are more exposed to the elements.
  • Keep a maintenance log with each oil change, recording the oil used and any observations during maintenance.

MotoSport.com: Your Trials Maintenance Source

Trust MotoSport.com to provide all the parts, tools, and oils you need for regular maintenance on your 2009 GAS GAS TXT PRO 280. Our experts can help you find the correct lubricants and answer any additional maintenance questions. Ride safe and perform regular maintenance to keep your trials bike at peak performance.

Related Shopping Categories

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Shop Oil Drain Pans for a 2009 GAS GAS TXT PRO 280 Dirt Bike.

Shop Tools for a 2009 GAS GAS TXT PRO 280 Dirt Bike.

Shop Oil Fillers and Drain Plugs for a 2009 GAS GAS TXT PRO 280 Dirt Bike.

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.