#### Worn Piston Rings
Worn piston rings may cause the 2004 Honda 400ex to burn oil fast because they can no longer properly seal the combustion chamber, allowing oil to seep into the cylinder and be burned.
#### Worn Valve Guides
Worn valve guides may cause the 2004 Honda 400ex to burn oil fast because they can no longer properly seal the valve stems, allowing oil to seep into the combustion chamber and be burned.
#### Incorrect Oil Level
Incorrect oil level may cause the 2004 Honda 400ex to burn oil fast because too much oil can cause the oil to splash up on the cylinder walls and be burned, and too little oil can cause the oil to overheat and break down, leading to increased oil consumption and burning.
#### Leaking Oil Filter
A leaking oil filter may cause the 2004 Honda 400ex to burn oil fast because it allows oil to leak out of the engine, leading to decreased oil levels and increased oil consumption and burning.
#### Leaking Oil Pan Gasket
A leaking oil pan gasket may cause the 2004 Honda 400ex to burn oil fast because it allows oil to leak out of the engine, leading to decreased oil levels and increased oil consumption and burning.
