Briggs and Stratton Sprint, Classic and Quattro Engines
Briggs and Stratton Sprint, Classic and Quattro vertical crankshaft ( rotary lawnmower etc) engines typically range from 3.5HP to 4HP
and are identified as 35, 375, 40.
Their Briggs & Stratton Engine Model numbers start with either 9 or 10.
They have a foam type air filter in a canister on top of the carburetor with a single long screw.
There is a rubber push primer on the side of the carburetor for cold engine starting
The carburetor is mounted on top of the engines metal fuel tank.