Small Engine Troubleshooting Problems? Ask a Mechanic Now.
Hello John. My name is***** will be happy to assist you. Many times when this problem occurs, the first to check, is your oil level, and the condition of your oil. Make sure your oil is not overfilled.
If your oil level is ok, then it is likely you have either a blow head gasket, or a valve that is not properly sealing, allowing excessive pressure into your crankcase.
You and I can continue from here. Thanks!