14521-ZV7-010 Tim Blt Adj Spring - Overview. The 14521-ZV7-010 Tim Blt Adj Spring is an essential component of Honda marine engine systems, specifically supporting the timing belt system. This spring maintains the correct tension on the timing belt, critical for synchronizing the camshaft and crankshaft movements which ensures efficient engine operation and longevity. The part is engineered to integrate seamlessly with existing components, preserving optimal engine performance and durability.. K