This starter clutch gear assembly kit is a direct replacement part designed for the YS250 and YS 250 motorcycles.The unit features a one-way bearing fully assembled with hardened sprague rollers.Both the bearing hub and gear are machined from forged, hardened steel and induction heat-treated to meet equipment specifications.This kit allows for plug-and-play installation to restore standard starting function.Please verify compatibility with your specific motorcycle model before purchase.