232259 66 Description Main Jet 170

This Mikuni HSR main jet, size #170, is a precision brass component used for tuning the high-speed fuel circuit in HSR42, HSR45, and HSR48 carburetors. Often utilized in Harley-Davidson performance applications, this larger jet size is ideal for engines with significant modifications that require increased fuel flow at wide-open throttle. Mikuni's reputation for precision engineering ensures that this jet provides a consistent and accurate flow rate, which is essential for preventing lean conditions during high-performance operation. Whether you are tuning for a custom build or optimizing a touring bike, this genuine Mikuni part provides the reliability and performance necessary to get the most out of your SmoothBore carburetor setup.