1. Gather the necessary tools and materials:
* Oil drain pan
* Funnel
* New oil filter (optional)
* New oil (check your owner's manual for the correct type and amount)
* Wrench
* Rags
2. Prepare the bike:
* Ensure that the bike is in a safe and secure position, either on a stand or with the kickstand down.
* Allow the engine to cool down if it has been running recently.
3. Locate the oil drain plug:
* The oil drain plug is usually located on the bottom of the engine casing. It is typically a bolt with a washer.
4. Place the oil drain pan under the drain plug:
* Make sure the pan is large enough to catch all the oil that will drain out.
5. Loosen the oil drain plug:
* Use the wrench to loosen the oil drain plug. Be careful not to drop the bolt into the oil pan.
6. Allow the oil to drain:
* Allow all of the oil to drain out of the engine into the oil pan. This may take a few minutes.
7. Replace the oil drain plug:
* Once all of the oil has drained out, replace the oil drain plug and tighten it securely.
8. Remove the old oil filter (optional):
* If you are changing the oil filter, now is the time to do so.
* Locate the oil filter, which is usually near the top of the engine.
* Use the wrench to loosen the oil filter and remove it.
* Be careful not to spill any oil.
* Apply a thin coat of new oil to the gasket of the new oil filter before installing it.
* Screw on the new oil filter until it is snug. Do not over-tighten.
9. Add new oil:
* Use the funnel to add new oil to the engine.
* Add the amount of oil specified in your owner's manual.
* Check the oil level using the dipstick to ensure that it is at the correct level.
10. Start the bike and let it run for a few minutes:
* This will circulate the new oil throughout the engine and help to remove any residual old oil.
11. Check the oil level again and add more oil if necessary.
Your 2000 Yamaha TTR-90 dirt bike is now ready to ride!
