Yamaha Radiator Assembly YF1-89617-20-60. Overview. The Yamaha YF1-89617-20-60 Radiator Assembly is a genuine original equipment manufacturer component designed to help regulate engine temperature and maintain optimal cooling performance. The radiator assembly plays a critical role in dissipating heat generated during engine operation, allowing the cooling system to maintain stable operating temperatures and protect internal engine components.. A properly functioning radiator assembly ensures ef