Small Engine Troubleshooting Problems? Ask a Mechanic Now.
Your head gasket is blown between the cylinder and valve chamber. This causes oil in air filter and heavy smoke out the exhaust. or Check the cylinder compression. If the pistion rings are shot then the blow by will cause the problem you describe
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First thing to check would be to make certain that the crankcase is not overfilled with oil.
Then I would be looking for any kind of air leaks that may allow the crankcase to become pressurized which would cause it to blow oil out through the crankcase vent. If you see no problem there then I would proceed with replacing the crankcase breather assembly, I have seen the reed plate in the breather assembly crack or break which will also cause the same type of issue.
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