- Incorrect Oil Mixture: If the oil-to-gasoline ratio is too high, it can cause the engine to run rich, resulting in unburned fuel and oil mixture being expelled through the exhaust. Ensure you are using the correct oil mixture ratio specified in the owner's manual, typically around 20:1 to 32:1.
- Worn Piston Rings: Piston rings seal the combustion chamber, preventing excessive oil from entering the cylinder. Worn or damaged piston rings can allow oil to leak into the combustion chamber, leading to oil burning and spitting through the exhaust.
- Faulty Oil Pump: The oil pump regulates the flow of oil to the engine. If the oil pump is not working correctly or is set incorrectly, it can result in excessive oil being delivered to the engine, causing oil spitting.
- Incorrect Carburetor Settings: Improper carburetor settings, such as an overly rich fuel mixture, can lead to incomplete combustion and cause unburned fuel and oil to exit through the exhaust.
- Clogged Exhaust System: A blocked or partially clogged exhaust system can cause back pressure, leading to oil spitting. Check for any obstructions or carbon buildup in the exhaust pipe and muffler.
