How to Change the Oil in a 2010 GAS GAS TXT PRO 250

Shop parts for a 2010 GAS GAS TXT PRO 250 Dirt Bike.

Changing the oil in your 2010 GAS GAS TXT PRO 250 is a key maintenance step to keep your engine running reliably and efficiently. Below you'll find the tools required, a detailed step-by-step procedure, and important callouts specific to this make and model. This oil change guide is proprietary to MotoSport.com and is designed for both novice and experienced riders.

Tools & Materials Needed

  • Socket set (including correct size for drain bolt, usually 13mm or 14mm – check your model)
  • Torque wrench (capable of 10-15 ft-lbs)
  • Drain pan
  • Clean rags or shop towels
  • Oil funnel
  • Flathead screwdriver (for any oil screen removal if applicable)
  • Needle nose pliers (helpful for removing drain plug washers or oil screens)
  • New crush washer or sealing washer for drain plug (recommended every change for a tight seal)
  • Appropriate oil – 370cc of high-quality gear oil (e.g., NILS Clutch Trial, as recommended) or your preferred specialist gear oil without friction modifiers such as GRO Gear Oil
  • Protective gloves (optional)

Step-by-Step Oil Change Instructions

  1. Warm the Engine
    • Run your bike for 3-5 minutes to warm the oil, which helps it flow more freely and removes contaminants.
    • Let it cool slightly to prevent burns, but don't attempt on a fully cold engine.
  2. Prepare Your Work Area
    • Park your bike on a level surface using the stand.
    • Place a drain pan beneath the engine.
  3. Remove the Drain Plug
    • Locate the drain plug on the underside of the gear case (right-hand side for TXT models).
    • Use the socket and wrench to carefully loosen and remove the drain bolt. Do not overtighten when reinstalling to avoid stripping the threads .
    • Allow the old oil to drain completely—this may take several minutes.
    • If equipped, remove the oil screen or filter (a flathead or pliers may help), and inspect for metal shavings. Clean thoroughly and replace if needed .
  4. Replace Washer and Inspect the Drain Plug
    • Inspect the crush/sealing washer on the drain bolt. Replace with a new one for a proper seal.
    • Clean any debris from the magnet or tip if your drain bolt is magnetic.
  5. Reinstall Drain Plug
    • Thread the cleaned plug (with new washer) by hand to avoid cross-threading.
    • Tighten with a torque wrench to about 14.8 ft-lbs (20 Nm), or as specified for your model. Do not overtighten; overtightening can strip the soft aluminum threads .
  6. Refill with Oil
    • Locate the oil fill cap (usually on the right side of the engine, just above the clutch cover).
    • Insert a funnel and pour in 370cc of the recommended 75W gear oil or equivalent (do not exceed the specified volume) .
    • Wipe up any spills to prevent buildup of grime or a slippery surface.
  7. Check Your Work
    • With the bike upright (not on the stand), check the oil level via the sight window or dipstick, if so equipped.
    • Start the motorcycle and let it idle for a minute, then shut off and check for leaks around the drain bolt and fill cap.
    • Top up if needed, but avoid overfilling.
    • Dispose of old oil at a local recycling center or auto shop—never pour down a drain or into the ground.

Model-Specific Call-outs for 2010 GAS GAS TXT PRO 250

  • Oil Type: This model requires 370cc of specialty gear oil; avoid using engine oils with friction modifiers to prevent clutch slippage .
  • Sensitive Aluminum Cases: Be extremely careful not to overtighten the drain plug. Many TXT cases are soft and prone to thread stripping .
  • Drain Plug Location: The drain bolt is positioned on the right side but slightly beneath and can collect dirt easily. Clean the area around the plug well before removal to prevent contaminants from entering the gearbox .
  • Crush Washer: Always inspect and replace the washer to ensure no leaks occur on reinstallation. Not replacing it can lead to persistent oil leaks .
  • Oil Screen: Clean thoroughly and inspect for metal debris at every change. The screen can sometimes be offset if not installed properly; gently seat it with needle nose pliers to ensure a correct fit .
  • Oil Recommendations: Owners often use brands such as GRO or NILS for trials-specific clutch action and longevity .
  • Maintenance Interval: Change gear oil every 10-20 riding hours for optimal clutch and transmission life (more frequent in harsh or competitive conditions).

For more technical support and genuine parts, rely on MotoSport.com for your GAS GAS maintenance needs. Proper oil changes help maximize performance, clutch feel, and the life of your TXT PRO 250—ride safe and ride smart.

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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.