Honda TRX90 Oil Change

Regular oil changes are essential for all vehicles, especially those with no oil filter, like a small TRX90 Honda ATV. The absence of an oil filter means replacing the oil often is the best way to protect the engine. 

Watch the video above and follow the steps below to see how to change the engine oil in a Honda TRX90.

NOTE: The process for changing the oil in a Honda TRX 90 is the same or similar for most small ATVs without oil filters. 

Tools and Supplies – Honda TRX90 Oil Change 

• Ratchet
• 17mm socket
• Torque wrench
• Drain pan
• 10W30 motor oil

How to Change Honda TRX90 Engine Oil

Step 1. Run the engine for a minute to warm the oil, then shut it off and remove the dipstick so the crankcase can vent. This step helps the oil drain out faster. 

Step 2. Position a drain pan beneath the engine, and remove the 17mm drain bolt and crush washer from the bottom of the crankcase.

Step 3. Inspect the crush washer for wear and replace it if necessary. 

NOTE: The crush washer should be replaced after every few oil changes, regardless of what condition it’s in. 

Step 4. Reinstall the drain bolt and crush washer, and torque them to 17 foot-pounds.

Step 5. Refill the engine with 0.75 quarts of 10W30 4-stroke motor oil. 

Step 6. Reinstall the dipstick, then start the engine and run it for half a minute on idle to distribute the oil throughout the motor.

Step 7. Shut off the engine and let it sit for a minute so the oil can settle.

Step 8. Remove the dipstick, then wipe it clean and set it back into the crankcase without screwing it in. Next, remove the dipstick again to read the oil level.

Step 9. Top off the oil if necessary, then reinstall the dipstick and you’re done.

Were you looking for information on how to change the oil on a larger Honda ATV with an oil filter? Watch the video above to see how to change the oil in a Honda Foreman 500.