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briggs and straton, kohler, or kawasaki, depending on the model
The Briggs and Straton Quattro is a 4 hp engine
The Briggs and Straton Quattro is a 4 HP
100 inch/pounds
It just unscrews from the motor
.002-.005 intake and, .005-.007 exhaust
it will hold about a half quart of oil
B&S site
The engine is flooding or the spark plug is fouled and not burning all the fuel, allowing the excess gas to seep into the oil reservoir via the piston cylinder. Cleaning or changinge the spark plug and doing a carburetor adjustment will help.
Is it an OHV engine? If so they would be loctaed above the piston head on your mower.