Valve chamber on a B & S Model N, like the first engine I ever worked on, in 1954. Breather is the device held down by a spring under the stud. It basically is just a disk in a cage.
The first motor I worked on was a B&S as well.
Don’t have any idea of the model.
On my home made go cart.
Came off a reel type lawn mower.
Kid would have to thave seat belts, air
bags, turn signals / flashers , 5 mph bumpers,
and who knows what else to build his
own today. How did we survive?
Tubs.
A "Boathouse Repair" is one thats done without having tools or the skills to do it properly.