>* Low oil level. If the oil level is low, the engine will not be able to properly lubricate itself, which can cause the engine to overheat and smoke. Check the oil level and add oil if necessary.
>* Dirty oil. Dirty oil can also cause the engine to overheat and smoke. Change the oil regularly according to the manufacturer's recommendations.
>* Worn piston rings. Worn piston rings can allow oil to leak into the combustion chamber, which can cause the engine to smoke. Have the piston rings replaced if they are worn.
>* Damaged cylinder. A damaged cylinder can also allow oil to leak into the combustion chamber, which can cause the engine to smoke. Have the cylinder repaired or replaced if it is damaged.
>* Valve seals. Worn valve seals can allow oil to leak into the combustion chamber, which can cause the engine to smoke. Have the valve seals replaced if they are worn.
>* Leaking head gasket. A leaking head gasket can allow coolant to enter the combustion chamber, which can cause the engine to smoke. Have the head gasket replaced if it is leaking.
>* Other: Incorrectly installed air filter or spark plug, too much fuel in the carburetor, a sticking choke or incorrect valve adjustment can all create excess smoke.
If you are unable to identify and fix the cause of the smoking yourself, you should take your Honda Fourtrax 300 to a qualified mechanic for further diagnosis and repair.
