88mm Cylinder Piston Ring Set for GX390 GXV390 GX 390 13HP Motor Gas Engine Replacement 13010-ZF6-003 This piston ring set is designed for use with 88mm cylinder engines.It is compatible with GX390, GXV390, and GX 390 13HP gas engine models.The set includes all necessary rings for cylinder rebuilding and serves as a replacement 13010-ZF6-003.It supports engine performance by maintaining proper compression and reducing oil consumption.The rings are engineered to fit standard 88mm bores and are intended for use in small engine applications requiring internal components.