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This is the carburetor mating part of a three piece set of parts that make up a velocity stack / air trumpet for the ZX9R Kehein CVR carburetor. This part needs to be ordered in conjunction with an 'Bellmouth'' part and an 'Inner Piece' part per carb.
The Mating Part bolts to the CVR carb, holding the Inner Piece in place as it does so. The Bellmouth part is pushed onto the end of the Inner Piece and held in place with a 4mm wide tie wrap. Simple!
The system is designed to be installed within an air filter and come with a tabbed flange for that purpose.