I have a wood's riding mower with a Briggs 18 HP v-twin engine. After mowing 2-3 times the air cleaner is soaked with oil and the engine loses power. Rings have been replaced and all o-rings and gaskets. Has there been problems with air cleaners not allowing enough air into the engine. The engine has great power and doesn't use oil other than sucking oil up through the crankcase vent tube. Any help or suggestions.
