Circular Aluminum Seal Ring. Constructed from CNC-machined high quality aluminum, this optional sealing ring is intended for the OS .21 on-road and off-road engines carburetor to provide supreme protection from air and ...

Reducer, with included o-rings. This restrictor comes included with the B2101 engine. The carburetor restrictor (or venturi) is used to adjust the flow of air into the engine. By changing the size ...