How to Change the Oil in a 2006 Yamaha TTR90

Shop parts for a 2006 Yamaha TTR90 Dirt Bike.

Regular oil changes are essential to keep your 2006 Yamaha TTR90 running smoothly and prolonging the life of your engine. The TTR90 is a small, air-cooled dirt bike without an oil filter, making oil changes straightforward but crucial for proper maintenance. This guide covers everything you need to know about changing the oil, with special call-outs for the TTR90 model and year.

Tools & Materials Needed

  • 12mm socket and ratchet with extension (for drain plug)
  • Oil catch pan
  • Funnel
  • Clean rags or paper towels
  • Recommended oil: 10W-40 motorcycle oil (approx. 1 quart)
  • Gloves (optional but recommended)
  • Torque wrench (optional, for precise tightening)

Key Model-Specific Call-Outs for the 2006 Yamaha TTR90

  • This model does not use an oil filter–a drain and refill is all that's needed.
  • The drain plug is a 12mm bolt located on the lower right side of the engine.
    Tip: The location is recessed, so extensions for your socket are helpful.
    Reference: The oil drain is on this side of the bike and that's it right there… this is a 12 mm but you can see it's pretty far back there .
  • Use only motorcycle-specific 10W-40 oil. Do not use automotive oil due to clutch performance requirements .
  • Ensure the bike is straight and level when checking and filling oil for accurate measurement.

Step-by-Step Instructions

  1. Warm up the Engine
    Start the bike and let it idle for 5–10 minutes, or take a short ride. This warms the oil, making it flow more easily and helps remove contaminants.
    Reference: Start it up, let it warm up for about 5 to 10 minutes... that’s going to get the oil heated up and it'll be a lot easier to drain .
  2. Secure the Bike
    Place the bike on a flat surface, using a stand if possible, to keep it upright.
  3. Remove the Oil Fill Cap/Dipstick
    Unscrew and remove the dipstick from the right side of the engine. Set it aside.
    This step allows air in, so oil drains more quickly.
  4. Locate and Remove the Drain Plug
    Find the 12mm drain bolt under the engine, on the right side toward the rear.
    Place your catch pan underneath. Loosen and remove the bolt carefully with a socket and extension.
    Reference: You have your socket, you put it on... that's where your drain plug is... 12 millimeter you unbolt that and drain the oil out .
  5. Drain the Old Oil
    Allow all the oil to drain completely–tilting the bike gently side to side can help remove all residual oil. Inspect the old oil for excessive dirt or metal shavings, which could indicate engine wear.
  6. Reinstall the Drain Plug
    Wipe the plug clean and inspect for damage. Reinstall by hand, then tighten securely with your socket. Do not over-tighten to avoid stripping the threads (torque spec is around 14 ft-lb if you have a wrench, otherwise snug plus a firm tug).
  7. Add New Oil
    Place a funnel in the oil fill port. Begin adding fresh 10W-40 oil – about 1 quart.
    Note: Fill slowly and periodically check the oil level by reinserting the dipstick without screwing it in. Add until the oil is at the center of the dipstick's cross-hatched area.
    Reference: Use 10w40 in this bike motorcycle oil... check the oil you should use... .
  8. Check for Leaks
    With the drain bolt tight and dipstick reinstalled, wipe off excess oil from around the drain plug and fill area. Start the engine, let it idle for a minute, then shut it off. Wait a minute, then re-check the dipstick and top up if needed.
  9. Dispose of Used Oil Properly
    Pour the old oil into a sealed container and take it to an appropriate recycling location.

Important Maintenance Reminders

  • Change oil every 6–8 hours of ride time or at least once per season for light use.
  • Avoid overfilling the crankcase.
  • If your TTR90 sits for a long time and you smell fuel in the oil, change it immediately–fuel dilution can damage engine components .
  • After the first ride post-change, check the level again and add oil if necessary.

Final Model Specific Tips

  • The TTR90 does not have an oil filter to replace, making maintenance simple.
  • Be gentle with the drain bolt. The threads can strip if overtightened–always start by hand.
  • Watch for gas contamination if stored improperly or if the carburetor leaks–gas in the oil can cause engine harm .

Conclusion

With consistent oil changes and careful attention to detail, your 2006 Yamaha TTR90 will deliver reliable performance and longevity on the trail. Regularly inspect for leaks, use the recommended oil, and be gentle with all fasteners to keep your dirt bike in excellent shape.

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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.