Motorcycle One-way Starter Clutch & Starter FreeWheel Kit for Benelli 502C Leoncino 500 TRK502 TRK502X matched Fit For Benelli 502C Leoncino 500 TRK502 TRK502X twin cylinder engine electric starter assembly; identical spline tooth bolt hole layout for direct OEM replacement Simple bolt on assembly; no or extra required during engine overhaul; onto crankshaft starter gear mounting position roller one-way locking structure; stable torque transmission during cranking; automatically release after engine startup to avoid reverse drag starter motor from damage carbon gear with frequency quenching; wear roller inner race surface; resist deformation under heavy torque long-term engine vibration load Strict OEM dimensional tolerance; effectively fix common failures including starter slipping grinding noise hard cold start premature starter motor burnout