39 mm piston assembly for ECHO CS-350/CS-351 chainsaw, cylinder block, engine component P021-009250

This product is specifically designed for the ECHO CS-350 and CS-351 heavy-duty chainsaws. Original factory specifications for this model: 39 mm piston cylinder block, drive unit (cylinder assembly). Corresponding ECHO original part number: P021-009250. This component is an essential part of the engine repair solution. It typically includes key components such as a precision-machined cylinder block, a matching piston, and piston rings. Manufactured in strict accordance with the original manufacturer's technical standards and performance parameters, this component addresses issues such as cylinder wear, piston ring failure, cylinder seizing, or compression loss due to continuous operation, insufficient lubrication, or overheating. Replacing this component can fully restore the engine's compression ratio, power, and fuel efficiency, allowing the machine to deliver robust and reliable cutting performance.