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The used intake manifold without a reservoir bag for the BMW Isetta engine (part number 1-107) connects the carburetor to the cylinder head and directs the fresh air efficiently to the combustion chamber. To ensure reliable operation in a restored engine, sealing surfaces, threads, and the manifold body must be carefully inspected and reworked if necessary. During restoration, it is recommended to use new gaskets and check the intake tract for sources of air leaks.