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Where is the engine oil drain plug on a Honda CRF 450?

Right side bottom of the engine case.

1. Make sure the oil is warmed up.

2. Place an oil pan under the drain plug.

3. Loosen the oil drain plug with a 17mm wrench.

4. Allow the oil to drain completely.

5. Reinstall the oil drain plug and tighten it securely.

6. Add new oil to the engine.