232215 66 Description Main Jet 185

This Mikuni HSR main jet, size #185, is designed for fine-tuning the fuel delivery in Mikuni HSR42, HSR45, and HSR48 carburetors. Machined from high-quality brass, this jet regulates the fuel mixture during high-speed operation and full-throttle acceleration. Selecting the correct main jet size is crucial for achieving the ideal air-fuel ratio, especially after performance upgrades like high-flow air cleaners or exhaust systems. Genuine Mikuni jets provide the accuracy required for professional-grade tuning, ensuring the engine runs efficiently and produces maximum power across the upper RPM range.