Cylinder kit for motorcycle with 65.5mm bore, 165cc displacement, compatible with GN125, GS125, EN125, and EN125HU models equipped with K157FMI engines.This cylinder kit is designed to increase engine displacement from 125cc to 165cc, enhancing power output and throttle response.Constructed from aluminum, the cylinder block contributes to reduced weight while supporting improved performance and.The kit includes a cylinder barrel, complete piston assembly, ring set, and gasket set, all engineered for precise fitment and.It is built to ISO9000 standards, consistent manufacturing quality.Installation is straightforward and matches the specifications of the compatible models, allowing for integration without major modifications.Intended for riders seeking to upgrade their engine performance, this kit offers a direct solution for increasing engine capacity while maintaining structural integrity.It is suitable for both experienced users and enthusiasts with basic mechanical knowledge.No installation manual is included.This product is not manufactured by the brand.Model and brand mentions are for compatibility guidance only.