232256 66 Description Main Jet 147 5

This Mikuni HSR main jet, size #147.5, is a precision-engineered brass component designed for high-performance tuning. It is compatible with Mikuni HSR42, HSR45, and HSR48 carburetors, which are frequently used on Harley-Davidson Big Twin and Sportster models to improve power and torque. The main jet controls the fuel flow during mid-to-full throttle operation, making it a critical part of the engine's performance profile. Mikuni's manufacturing process ensures that each jet provides an exact flow rate, allowing for predictable and repeatable tuning results. Whether you are adjusting for altitude or engine modifications, this genuine Mikuni jet provides the accuracy required to optimize the air-fuel mixture for maximum efficiency and throttle response.