4149 160 2902 STIHL Clutch Drum – Genuine OEM Part4149 160 2902 STIHL Clutch Drum Genuine OEM Part The STIHL Clutch Drum (4149 160 2902) is a genuine OEM clutch drum designed for use on a wide range of STIHL trimmers, brushcutters, Kombi engines, hedge trimmers, and blower units. Serial number ranges apply on certain models (see compatibility list below). The clutch drum works together with the centrifugal clutch to transfer engine power into the drive system. It spins when the clutch engages,