i dont know what single port means or twin port means. or what i have could anybody help me please
i have a 1971 superbug 1600
Thanks for the help

its just the type of inlet manifold

single port is just that a single inlet into each head

twin port splits into two before going into the heads

just for the record you bug had a 1600 twin port originally but after 38 years could be anything now

oh ok i understand now thanks for your help