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Category dedicated to Mikuni breather kits, designed to improve crankcase and gearbox ventilation in American and custom motorcycle engines. These kits typically include breather plugs, O-rings, washers, and in some models, gas diversion tubes or oil filters.
These assemblies allow the fitting of the Mikuni Smoothbore carburettor kit on Big Twin from 1993-1999 and Sportster…
They are essential components for preventing internal pressure build-up, reducing oil leaks from seals, and improving engine breathing, particularly in high-performance or modified intake configurations. Mikuni kits are compatible with various engine families, including Evolution, Twin Cam and Milwaukee Eight, as well as Sportster, Dyna, Softail and Touring applications. Installation is recommended to maintain the integrity of the primary and secondary ventilation systems, ensuring optimal carburettor and crankcase operation.