Chainsaw Repair

Yes, you're right.

In the bottom image that you provided, with the gaskets and O rings, I can identify the exhaust gasket, the gasket that goes between the cylinder and the intake manifold, and the gasket that goes between the intake manifold and the carburetor.

The pulse comes out of the cylinder through the low hole, next to the lower mounting screw hole. It passes through the low hole in the intake manifold to the carburetor. The carburetor has a semi-circular channel to carry the pulse from the incoming low hole to the top of the carburetor to operate the diaphragm (or flapper valves?) up there.

Not sure where the O rings are intended for, or the two other round things in the bottom image. Can you tell me where these are intended to go?

Thanks