Applicable to 3/8"-7T pinion clutch drum, CS-310 recoil starter assembly, Echo CS-352/CS-31

This complete repair kit is specifically designed for the ECHO CS-310, CS-351, and CS-352 series chainsaws. It includes a 3/8" 7-tooth drive sprocket drum (3/8"-7T) and a recoil starter. This kit allows you to repair two key components: the transmission and the starting system. The drive sprocket drum, consisting of the drive sprocket and clutch drum, is the central element for transferring power to the chain. The recoil starter, consisting of the pulley, spring, and starter rope, forms the heart of the manual starting system. By replacing worn, damaged, or fatigue-broken original parts, problems such as chain slippage, starting difficulties, and recoil starter malfunctions are resolved, restoring the basic functionality of the machine.