How to Change the Oil in a 2012 Yamaha TTR125L

Shop parts for a 2012 Yamaha TTR125L Dirt Bike.

Welcome to MotoSport.com's step-by-step guide for changing the oil in your 2012 Yamaha TTR125L. Regular oil changes are critical to ensure the longevity and smooth operation of your dirt bike. The process is beginner-friendly and requires only a handful of tools. This guide walks you through each step, with important call-outs specific to the 2012 TTR125L model.

Tools and Materials Needed

  • Socket wrench with extension and the appropriate socket (typically 14mm for the drain bolt)
  • Drain pan
  • Funnel
  • Clean rags or shop towels
  • Replacement engine oil (Yamalube 10W-40 or equivalent, always check your owner’s manual for the exact specification and quantity; most TTR125 models use about 1.0L or 1.06 US quarts)
  • New crush washer for the drain bolt (optional but recommended)
  • Oil filter or oil screen (the TTR125L uses an oil screen rather than a typical cartridge filter–inspect and clean as needed during the oil change)
  • Gloves (to protect your hands)

Preparation Steps

  • Warm up the engine: Run the bike for a few minutes. Warm oil flows out more easily and helps carry contaminants with it.
  • Turn off the engine and make sure the bike is on a stable, level surface. Use the kickstand–since the drain bolt is on the left, the angle helps with drainage.
  • Have all your tools ready before you start.

Step-by-Step Oil Change Instructions

  1. Locate the oil drain bolt
    • The drain bolt is on the left side of the bike, near the bottom of the engine case. It’s the only drain bolt you need to remove for oil changes on this model. Be careful not to confuse it with adjacent bolts.
  2. Place a drain pan under the bike
    • Ensure the pan is large enough to catch all the old oil.
  3. Remove the drain bolt
    • Use your socket wrench and extension, turning counterclockwise. Avoid stripping the bolt; do not use excessive force.
  4. Allow the oil to completely drain
    • Let gravity do its job. You can gently tilt the bike upright for a moment to ensure maximum drainage. Some riders also briefly kick the starter (with the ignition off) to help flush out residual oil, but take extreme care (only do this if comfortable and safe).
  5. Optional: Clean the oil screen
    • The TTR125L doesn’t use a traditional filter cartridge. If desired, remove the right-side engine cover to access and clean the oil screen; refer to your service manual for instructions if you choose to do this extra step.
  6. Install a new crush washer (recommended)
    • This ensures a good seal and helps prevent leaks.
  7. Reinstall the drain bolt
    • Hand-tighten first, then use your wrench to snug it up. Do not over-tighten–“just snug” is ideal. Overtorquing can strip the threads on the engine case—a costly mistake for any dirt bike owner.
  8. Fill with fresh oil
    • Remove the oil fill cap (located on the right side near the rear of the engine case). Insert a funnel and pour in 1.0L / 1.06 US quarts of the recommended oil. Check your engine case; Yamaha thoughtfully lists the oil capacity right on it for reference.
  9. Check the oil level
    • With the bike upright (not on the kickstand), insert the dipstick without screwing it in, then remove to check the level. Oil should fall between the minimum and maximum marks. Add more oil if needed, but do not overfill.
  10. Dispose of old oil responsibly
    • Take used oil to an authorized recycling center–never dump it.
  11. Start the engine and recheck
    • Let the bike idle for a few minutes, then shut off and wait several minutes for the oil to settle. Recheck the oil level, top off if necessary, and check for leaks around the drain bolt and fill cap.

2012 Yamaha TTR125L-Specific Call-Outs

  • Drain bolt location: Always on the left side, easy to access even with a skid plate in place.
  • No cartridge-style oil filter: Look for the oil screen if you choose to inspect or clean it, not an oil filter that would need replacement.
  • Oil quantity: Double-check the engine case or owner’s manual for the proper amount. The 2012 model typically calls for 1.0L (1.06 US quarts).
  • Over-tightening warning: Do not over-torque the drain bolt. Stripping the aluminum threads in the engine case is a common mistake for new owners.
  • Check for leaks and oil level after first ride following each oil change for optimal engine life.

Pro Tips from MotoSport.com

  • Always run the bike and check for leaks after the change before heading out for a ride.
  • Perform an oil change after break-in periods and before long storage.
  • Keep a maintenance log for your TTR125L for resale value and reliability.

Your 2012 Yamaha TTR125L is simple to service, and routine oil changes are key to dependable rides. Keep this guide handy, and you’ll keep your TTR running strong all season long.

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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.