Yamaha Radiator Assembly YF1-G2927-20-60. Overview. The Yamaha YF1-G2927-20-60 Radiator Assembly is a genuine original equipment manufacturer component designed to regulate engine temperature by dissipating heat from the cooling system. The radiator plays a critical role in maintaining proper engine operating temperatures by transferring heat away from the coolant as it circulates through the engine.. A properly functioning radiator assembly helps prevent overheating and protects vital engine co