How to Change the Oil in a 2013 Yamaha TTR125L

Shop parts for a 2013 Yamaha TTR125L Dirt Bike.

Regular oil changes are a key part of keeping your 2013 Yamaha TTR125L running smoothly and extending engine life. The process is straightforward, with minimal tools required. Below you'll find a complete, step-by-step guide—proprietary to MotoSport.com—covering every detail, plus important notes unique to the TTR125L.

Tools and Supplies Needed

  • 10mm or 12mm wrench or socket (Check your drain bolt size; the TTR125L typically uses one of these sizes)
  • Drain pan for used oil
  • Clean rags or shop towels
  • Yamaha Yamalube 10W-40 oil or equivalent (consult user manual for correct spec and capacity)
  • Funnel
  • New crush washer for the drain bolt (recommended, inspect your current one for wear)
  • Gloves (optional but helps keep hands clean)

Pre-Change Preparation

  • Ensure the bike is on a level surface and stable, with the engine off.
  • Warm up the engine for a few minutes by idling it. Warm oil drains out more completely, taking more contaminants with it and ensuring a better refill. The engine should be warm to the touch, but not hot.
  • Turn off the engine and let it sit for a minute to settle the oil.

Step-by-Step Oil Change Instructions

  1. Locate the Drain Plug
    • On the 2013 Yamaha TTR125L, the oil drain bolt is located on the left side of the bike beneath the engine, close to the footpeg area. Having the bike leaning on its kickstand will help the oil drain more completely

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  2. Place the Drain Pan
    • Put your drain pan directly underneath the drain bolt.
  3. Remove the Oil Drain Bolt
    • Using your wrench or socket, carefully loosen and remove the drain bolt. Be cautious—the engine and oil may still be hot.
    • Let the oil drain completely. It may take a few minutes for all the oil to come out.
    • You can gently tip the bike upright (if safe), or kick it over a few times (without starting) to help evacuate more oil

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  4. Inspect and Replace the Crush Washer
    • Check the crush washer on the drain bolt for wear or flattening. Replace if damaged to prevent leaks.
  5. Reinstall the Drain Bolt
    • Screw the bolt back in by hand to avoid cross-threading. Tighten it just snug; do not overtighten. The TTR125L–s drain bolt does not require excessive torque

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  6. Remove the Oil Filler Cap
    • On the right side of the engine, unscrew the oil filler cap/dipstick.
  7. Add New Oil
    • Using a funnel, pour in the recommended quantity and grade of oil. The TTR125L typically takes just under 1 liter (refer to markings on the engine case for the exact amount

      ).
    • Replace and tighten the filler cap/dipstick.
  8. Check Oil Level
    • Start the engine and let it idle for about 30 seconds, then shut it off and wait a minute for the oil to settle.
    • Stand the bike upright and unscrew the dipstick. Wipe it clean, insert it (without screwing in), then remove and check to ensure the oil is between the min and max marks. Top off if needed, checking carefully

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  9. Dispose of Old Oil Properly
    • Take the used oil to a recycling center or auto parts store that accepts motor oil.

Model-Specific Notes for the 2013 Yamaha TTR125L

  • The TTR125L does not use a replaceable oil filter; only an oil screen is present, which does not require regular service during routine oil changes

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  • Crush washer longevity: Inspect carefully at every change; leaks can develop if this simple part is worn.
  • Torque spec: The drain bolt should be hand-tightened and not overtightened to avoid stripping the soft aluminum threads.
  • Oil capacity is conveniently stamped on the engine case on many Yamaha models–double-check your bike for this stamping before overfilling

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  • No filter cartridge: The oil change process is quicker versus motorcycles with a filter element.
  • For other years and minor TTR125 variants (E, LE, etc.), these instructions are essentially the same; always consult your owner’s manual if unsure

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Tips for Best Results

  • Make oil level checks a regular habit before rides to ensure engine health

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  • Always use oil meeting Yamaha/JASO motorcycle specifications; automotive oils may not protect your clutch and transmission.
  • If you ever spot metal flakes or unusually dark/dirty oil, consider a more thorough inspection or consult a mechanic.

Changing the oil on your 2013 Yamaha TTR125L is one of the easiest DIY maintenance jobs you can perform and will keep your motorcycle running like new on the trail. For more exclusive tutorials and OEM parts, trust MotoSport.com—your pro source for dirt bike maintenance.

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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.