Air Filter Cleaning – Replacement Guide for 2001 Yamaha TTR90

Shop parts for a 2001 Yamaha TTR90 Dirt Bike.

Regular air filter care keeps your 2001 Yamaha TTR90 running clean – protecting the engine from dust, dirt, and debris that can cause performance loss and premature wear. The TTR90's air filter setup is straightforward, making it ideal for DIY maintenance at home.

Unique Notes for the 2001 Yamaha TTR90 Owner

  • The air box cover is secured with three Phillips screws. Remove these screws to access the air filter.
    The filter itself is a foam element; this type is durable and easily serviced. Clean or replace as needed for optimal protection and engine health.
  • A lightly oiled filter improves dust trapping. Use specialized air filter oils for best results or, in a pinch, gear oil will work.
  • Replacement filters intended for newer TTR90 models (2005–2007) can also fit the 2001 TTR90. Pay attention to mounting holes and confirm course alignment before installing.
  • The TTR90's air box tends to trap grime. Clean both the air filter and the **inner air box cavity** during maintenance. Inspect the foam element for damage or heavy wear, and replace if needed.
  • Be cautious not to over-tighten screws — the air box and filter mounting plastic are easy to strip.

How to Clean the Air Filter

  1. Carefully remove the air box cover using a Phillips screwdriver.
  2. Take out the foam air filter element. Remove excess dirt from the surface by hand or with gentle tapping.
  3. Prepare a bucket of warm, soapy water. Submerge the foam filter and massage dirt out. Rinse thoroughly with clean water.
  4. Dry the filter completely. Do not wring the foam forcefully, which could tear it.
  5. Apply air filter oil evenly. Saturate the foam, then gently squeeze out any excess oil. The filter should be oily but not dripping.
  6. Clean the inside of the air box with a degreaser and a clean rag. Inspect the air box drain plug on the lower back side and empty if fluid is present.

How to Replace the Air Filter

  1. Match the new foam filter to the original. Punch out any uncut holes as needed for a clean fit.
  2. Lightly oil the new filter before installation.
  3. Set the foam in place, ensuring a full seal around the air box edge.
  4. Replace the air box cover and tighten the Phillips screws snuglyavoid over-tightening.

Tips for Best Results

  • Clean the filter every 1–3 rides, or after every dusty outing.
  • Always wear gloves while oiling the foam elementthe oil is sticky and tough to remove from your skin.
  • If the foam is torn, extremely dirty, or crumbling, replace it immediately to protect your carburetor and engine.
  • Safely dispose of cleaning solutions and oil according to local regulations.
  • Reinstall the filter snugly to prevent unfiltered air from bypassing the foam.

A clean, well-oiled air filter is essential to the life and performance of your 2001 Yamaha TTR90. Stay ahead of maintenance — it's easy, affordable, and keeps you riding longer.

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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.