How to Change the Oil in a 2001 Yamaha TTR90: A Complete Step-by-Step Guide

Shop parts for a 2001 Yamaha TTR90 Dirt Bike.

Regular oil changes are critical to keeping your 2001 Yamaha TTR90 running strong and extending the life of its engine. This proprietary MotoSport.com guide covers everything you need to know, from tools required to model-specific tips, so you can tackle this important maintenance task with confidence.

Tools & Supplies Needed

  • 12mm socket or box wrench – For removing the oil drain bolt
  • Socket extension (optional) – Makes reaching the drain bolt easier
  • Oil drain pan – To catch old oil
  • Clean rags/shop towels – For wiping spills and cleaning parts
  • Replacement motorcycle oil – 10W-40 motorcycle oil is recommended
  • Funnel – Helps prevent spills when refilling oil
  • Gloves (optional) – For keeping your hands clean

Important Call-Outs for the 2001 Yamaha TTR90

  • No oil filter: The TTR90 does not have a traditional oil filter that needs changing, simplifying the process.
  • Drain plug location: The drain bolt is located on the lower right side of the engine case, slightly tucked back; use a socket extension if it's hard to reach.
  • Use only motorcycle-specific oil: Automotive oils may not protect your clutch and engine properly.

Step-by-Step Oil Change Procedure

  1. Warm up the Engine
    • Start the engine and let it run for 5-10 minutes. This allows the oil to heat up and flow more easily when draining.
    • Shut off the engine and let the bike cool for a few minutes so you don’t burn yourself.
  2. Prep the Bike
    • Place the TTR90 on a level surface and use a stand if possible for stability.
    • Position your oil drain pan directly beneath the engine’s drain plug on the right side.
  3. Remove the Dipstick/Filler Cap
    • Unscrew the dipstick (located on the engine’s upper right side). This allows oil to drain faster by letting air in.
  4. Drain the Old Oil
    • Locate the 12mm drain bolt at the bottom-right side of the engine case.
    • Use your socket and extension to loosen and remove the bolt. Oil will begin to flow out—be careful, as it may come out quickly and could be hot.
    • Allow several minutes for all the oil to fully drain.
  5. Inspect the Oil and Bolt
    • Check the oil for any contaminants, such as metal shavings or a strong gasoline odor (gas in the oil could indicate a carburetor or fuel issue).
    • Clean the drain bolt and inspect the washer. Replace the washer if damaged to prevent leaks.
  6. Reinstall the Drain Bolt
    • Thread the drain bolt back in by hand to avoid cross-threading, then tighten it securely with your 12mm wrench. Do not overtighten—just snug is sufficient for the TTR90.
  7. Add Fresh Oil
    • Using a funnel, pour the recommended amount of 10W-40 motorcycle oil into the filler hole.
    • The TTR90 takes approximately 1 quart (about 1 liter) of oil. Always check your owner’s manual for confirmation.
  8. Check Oil Level
    • Insert the dipstick but do not screw it in. Pull it out and read the level. The oil should be between the two notches or dots on the dipstick.
    • If low, add a small amount of oil and recheck. Do not overfill, as this can cause engine damage.
  9. Finish and Clean Up
    • Screw the dipstick back in tightly.
    • Wipe off any spilled oil from the case and floor.
    • Start the engine and let it idle for 1-2 minutes. Shut it off, wait a minute, and recheck oil level—top off if necessary.
    • Dispose of your used oil responsibly at a recycling center or auto parts store.

Extra Tips for TTR90 Owners

  • Change oil every 10-20 hours of riding or at least once per season, whichever comes first.
  • If you notice a gas smell in the oil, do not delay oil changes and have your carburetor checked.
  • There is no oil filter—only routine oil changes flush out dirt and contaminants.
  • Check for oil leaks after each change—especially around the drain bolt and filler cap.

If you follow these steps, you’ll keep your Yamaha TTR90’s engine safely lubricated and running at its best. For quality motorcycle oil and service tools, visit MotoSport.com for everything you need.

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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.