N100604-180 Smoothbore jets, main 180

This Mikuni main jet is a precision-engineered brass component designed for smoothbore carburetors. It features a 180 sizing, allowing for meticulous fuel circuit calibration on Harley-Davidson motorcycles equipped with HSR series carburetors. Proper jetting is essential for achieving the correct air-fuel ratio across the throttle range, especially after exhaust or air cleaner modifications. Mikuni components are manufactured to exacting tolerances, ensuring consistent flow rates and reliable performance. This genuine replacement part is sold individually and serves as a critical tuning element for riders seeking to optimize their engine's power delivery and throttle response.