From the popular filter, brand is the Uni Two-Stage POD Straight Air Filter. Its clamp-on style makes it easy to mount onto your carburetor and its removable first stage sleeve makes its overall life last longer with the ability to replace and do maintenance as needed. Available in a variety of sizes.
Applications:
34mm: Zuma 50cc, Dellorto 19-21mm Carburetor
40mm:
42mm: Mikuni 24mm -28mm Carburetor
52mm: Keihin PWK 21-28mm Carburetor, Mikuni TM32
NOTE: Please oil before using for proper filtration.