How to Change the Oil in a 2014 GAS GAS TXT RACING 125

Proper maintenance is essential for getting the best performance and longevity from your 2014 GAS GAS TXT RACING 125 dirt bike. One of the key regular tasks is an oil change, which keeps the gearbox running smoothly and protects internal components from wear. This comprehensive guide—exclusive to MotoSport.com—covers every step involved, notes the specific requirements for your model, and highlights helpful tips for a quick, clean, and mess-free oil change.

Tools and Materials Needed

  • Socket wrench set (metric, to fit drain bolt)
  • Drain pan
  • Measuring cup or graduated container
  • Replacement crush washer (recommended but not always required)
  • Clean rags or towels
  • Funnel
  • Gearbox oil (approximately 0.42 quarts / 0.4 liters – high-quality synthetic or ATF Type F is common for trials bikes)
  • Oil syringe with tubing (recommended for cleaner filling, often supplied with GasGas models)
  • Oil drain tool (optional, for a cleaner process especially if you want to avoid oil on the frame or skidplate)
  • Gloves (for protection against hot oil and grime)

Step-by-Step Guide

  1. Warm Up the Engine
    Briefly run the engine for a few minutes to warm the oil. Warm oil drains faster and more completely.
  2. Stabilize the Bike
    Place your GAS GAS TXT RACING 125 on a level surface using a bike stand. This ensures all oil drains evenly.
  3. Locate the Drain Bolt
    The drain bolt for the gearbox is located on the lower part of the engine case—refer to your owner’s manual if unsure of the exact spot.
  4. Prepare Your Tools
    Position your drain pan beneath the drain bolt. Have your socket wrench and replacement washer ready.
  5. Remove the Drain Bolt
    Carefully unscrew the drain bolt using the appropriate socket. Oil will begin to flow out—ensure the pan is properly placed to catch it. Allow ample time for all old oil to drain.
    Tip: Some riders recommend tilting the bike slightly to the opposite side to help fully empty the gearbox.
  6. Check and Replace the Washer
    Inspect the crush washer for damage or flattening. Replace it if necessary to prevent future leaks.
  7. Inspect Drained Oil
    Examine the used oil for metallic particles (a little is normal in gearboxes) and sludge, which could indicate excessive wear.
  8. Reinstall the Drain Bolt
    Clean the bolt, fit the new or inspected washer, and reinstall. Tighten firmly but do not overtighten—refer to your manual for torque specs.
  9. Refill with Fresh Oil
    Using a funnel or the supplied syringe with tubing, add fresh gearbox oil. For the 2014 TXT RACING 125, the capacity is 0.42 quarts (0.4 liters) of recommended synthetic or ATF Type F oil.
    Pour slowly and carefully to avoid overfilling. If possible, measure the exact amount for accuracy.
  10. Check Oil Level
    Some TXT models have a sight glass; others require removal of an oil check bolt to verify correct fill. Consult your manual and add oil slowly as needed to reach the correct level.
  11. Wipe Down and Inspect for Leaks
    Clean any spilled oil from the case, frame, and skidplate. Start the engine, let it run briefly, then check for drips at the drain bolt.
  12. Dispose of Used Oil Properly
    Pour the old oil into a sealed container and take it to a recycling center or automotive shop that handles used oil.

Model-Specific Call-Outs for the 2014 GAS GAS TXT RACING 125

  • This bike uses a gearbox oil only—there is no engine oil supply since it is a two-stroke.
  • Oil capacity is 0.42 quarts (0.4 liters).
  • For best clutch performance, use oil suitable for wet clutches without friction modifiers–ATF Type F or high-quality synthetic gear oil is recommended.
  • Change the oil frequently, especially if you ride in wet conditions or ride trials regularly; the exact frequency can be tailored to how clean or dirty the oil appears when drained.
  • Syringe and tubing may be provided with some models for less mess during filling—this is especially helpful due to tight spaces on trials bikes.

Pro Tips for a Cleaner, Safer Oil Change

  • Warm engines drain more efficiently, but let the motor cool slightly so you don’t risk burns.
  • A dedicated oil drain tool is available for KTM, Husqvarna, and GasGas bikes to eliminate spills especially around the frame and skidplate.
  • Label your oil and change intervals to keep up with maintenance schedule and performance tracking.
  • Only use oils specifically suitable for wet clutches – friction modifiers seen in some automotive oils can cause clutch slip.

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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.