Carburetor inlet gasket T1 0010

The carburetor inlet gasket prevents air leaking to the engine.
(which can cause a lean mixture and possible overheating of the engine)
You need 3 gaskets per schmitt.

Don't use a gasket twice, ones tightened the gasket becomes flat and is not usable a second time.

the gasket is also part of the engine gasket set T3 0000
and the carburetor seal set T9 0305 Z