Chainsaw clutch drum assembly. When the engine's speed increases, the clutch engages the clutch drum and gear to drive the chain. If the chain isn't turning, the clutch drum may be defective.
Assembly-clutch drum w/bearing
Clutch drum and bearing. Pitch .325-Teeth 7.
Clutch drum with bearing, washer, and clip.
Silver streak spur sprocket
Kit - clutch drum & bearing