The C1Q-S58B carburettor is a genuine Stihl replacement unit for select light-duty brushcutters and trimmers, including the FS 55 and FS 55 C. Responsible for accurately metering the air-fuel mixture to support easy starting, smooth idle, and clean throttle response. Built with a durable die-cast aluminium body and fuel-resistant diaphragms and seals, it is designed for regular outdoor use. This carburettor is engineered to match the original fuel connections and linkage points, making it a direct replacement for a worn or contaminated original unit.