N100604-150 Smoothbore jets, main 150

This Mikuni main jet is a vital tuning component for smoothbore carburetors, responsible for fuel metering at higher throttle openings and peak RPM. Constructed from solid brass, this size 150 jet ensures a consistent and predictable fuel curve for Harley-Davidson engines utilizing Mikuni HSR series performance intakes. Accurate main jetting is essential to protect the engine from overheating due to lean conditions while ensuring maximum horsepower is achieved. Using authentic Mikuni hardware guarantees compatibility and precision that generic jets cannot provide. This part is sold individually, allowing for precise incremental adjustments to the air-fuel ratio to accommodate various exhaust systems or engine builds.