* Engine oil: If the engine oil is low, the engine will not be able to properly lubricate itself, which can cause the metal components to rub against each other and create smoke. Check the oil level and add more oil if necessary.
* Coolant: If the coolant level is low, the engine will not be able to properly cool itself down, which can cause the engine to overheat and produce smoke. Check the coolant level and add more coolant if necessary.
* Fuel mixture: If the fuel mixture is too rich, it can cause the engine to run rough and produce black smoke. Check the fuel mixture and adjust it if necessary.
* Bad piston rings: Worn or damaged piston rings can allow oil to leak into the combustion chamber, which can cause the engine to smoke. If you suspect that the piston rings are bad, you will need to take the engine apart and replace the rings.
* Blown head gasket: A blown head gasket can allow coolant to leak into the combustion chamber, which can cause the engine to smoke. If you suspect that the head gasket is blown, you will need to remove the cylinder head and replace the gasket.
If you are not sure what is causing your four wheeler to smoke, it is best to take it to a mechanic for diagnosis.
