This starter reduction gear shift kit features an integrated double-gear structure designed for the ZS177MM engine.The meshing of the starting and driven gears aims to reduce uneven wear and skipping to support consistent.Constructed from metal with heat treatment, the components are built to withstand frequent starting cycles in compression engines.This kit is specifically developed for the NC250 engine with precise dimensions for direct replacement installation without modification.The product includes one starter gear shift kit in titanium grey.Installation instructions are not included.This part is compatible with motorcycles equipped with the NC250 ZS177MM engine, including models from KAYO, BOSUER, KEWS (K16, K23), AVANTIS, REGULMOTO, ZUUMAV, GR, BRZ, STN, AJ1, and BSE.