Yamaha - Exchanger, heat - 6H4-12466-A0-00 Mercury-50HP-EFI-2015 No sudden temperature spikes or

No sudden temperature spikes or worrying warning tones — just a steady stream and a motor that stays happy

everything firing exactly as it should

debris-filled water conditions

All brass machined fittings

helping maintain smooth control feel and reliable operation

Yamaha - Exchanger, heat - 6H4-12466-A0-00 Mercury-50HP-EFI-2015 No sudden temperature spikes orYamaha Heat Exchanger Engine Cooling System 6H4 12466 A0 00 Overview When cooling systems start acting up, its not always the obvious stuff like the impellersometimes its deeper in the system. Ive worked on motors where temps crept up slowly, and it traced back to restricted or failing heat exchangers. This part plays a big role in keeping engine temps stable under load. When its working right, the motor runs clean and consistent, even on long runs.