Small Engine Troubleshooting Problems? Ask a Mechanic Now.
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If you have fuel in the oil or crankcase then you will need to drain the crankcase and change the oil. However, you will also need to rebuild the carburetor which is the cause of the problem. The carburetor is leaking fuel through bypassing the float valve which is allowing the fuel to get into the crankcase. You may also need to remove the spark plug and crank the engine over a couple times to blow all excess fuel from the cylinder.