How to Change the Oil in a 2008 Yamaha TTR50 (Proprietary to MotoSport.com)

Shop Parts for a 2008 Yamaha TTR50 Dirt Bike.

Keeping your Yamaha TTR50’s engine oil clean is crucial for maintaining performance and long-term reliability. The oil lubricates internal components, reduces engine wear, and prevents damage. Follow this comprehensive step-by-step guide tailored specifically for the 2008 Yamaha TTR50, including specific call-outs for this model, a list of necessary tools and supplies, and essential tips for a flawless oil change.

Tools and Supplies Needed

  • 10W-40 motorcycle oil (Yamaha recommends 800ml for this model–see call-outs below)
  • Oil drain pan
  • 17mm socket and socket wrench
  • Torque wrench (optional, for precise reinstallation of drain bolt)
  • Funnel
  • Clean rags or paper towels
  • Gloves (optional, but recommended for cleanliness and safety)

Preparation Steps

  • Place your TTR50 on a level surface with the bike upright–for the most accurate oil level readings and a clean work environment.
  • Warm up the engine for several minutes to thin the oil, which aids in a more complete drain.
  • Switch off the engine and allow it to cool slightly to avoid burns.

Draining the Old Oil

  • Locate the oil drain bolt beneath the engine. (On the TTR50, it's most easily accessed with the bike off the kickstand, as the bolt is near the bottom of the crankcase.)
  • With your oil drain pan positioned below the drain bolt, use a 17mm socket to remove the bolt carefully. Hold onto the bolt so it doesn’t fall into the pan.
  • Let the oil drain completely. This can take a few minutes; tilting the bike slightly side to side can help remove all the old oil.
  • While draining, check the condition of the drain bolt’s washer and replace it if it’s damaged (to prevent leaks).

Reinstalling the Drain Bolt

  • Once all oil is drained, clean the drain bolt and its threads.
  • Reinstall the bolt by hand first to avoid cross-threading, then tighten it securely with your socket. Do not over-tighten–specification is about 17 ft-lb if using a torque wrench.
  • Wipe away any spilled oil around the drain area.

Adding New Oil

  • Remove the oil fill cap/dipstick from the right side of the engine.
  • Place a funnel in the fill hole and pour in approximately 750-800ml of 10W-40 motorcycle oil. (Yamaha’s manual and the side case indicate 800ml, but starting with 750ml is safer as it’s easier to add than remove excess oil.)
  • Periodically check the oil level on the dipstick:
    • Insert the dipstick into the filler hole, but do not screw it in for checking–just place it in and remove it to observe the oil level.
    • The oil should register between the minimum and maximum marks on the dipstick. If low, add small increments, rechecking each time. If too high, loosen the drain bolt slightly to let out a small amount until correct.
  • Replace and tighten the filler cap/dipstick once the correct level is achieved.

Double-Checking and Clean Up

  • Start the engine and let it idle for 1–2 minutes. This allows oil to circulate and the level to stabilize.
  • Shut off the engine and allow it to sit for a minute, then recheck the oil level with the dipstick and top up if necessary.
  • Check for leaks around the drain bolt and filter area. If any leaks are present, address them before riding.
  • Dispose of your old oil at a proper recycling or collection facility.
  • Clean your tools and store the bike as normal–a Yamaha technician always finishes with clean tools.

Specific Tips for the 2008 Yamaha TTR50

  • Oil capacity: 800ml (0.8L) is the target fill for this engine. Overfilling can force oil into the airbox, causing poor running and potential damage, so always check and double-check the level.
  • Oil type: Use only motorcycle-grade 10W-40 oil. Automotive oils may not protect the bike’s wet clutch system properly.
  • If your TTR50 has sat for an extended period or has a small oil leak, consider changing the oil every few months–even if you haven’t reached the 10-hour riding interval. Frequent changes keep contaminants from harming the internal engine.
  • When rechecking oil after filling, always have the bike upright and level–not leaning on the stand–for accurate dipstick readings.
  • Watch out for the oil fill cap and dipstick: it’s plastic and should only be hand-tightened to prevent stripping the threads.

Final Thoughts

With a straightforward oil change, your 2008 Yamaha TTR50 will stay ready for any trail or track. Follow the steps above precisely, and always use top-quality supplies from MotoSport.com for the best results and peace of mind.

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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.