Yamaha - Cover, water pump - YF1-43847-37-70Yamaha Water Pump Cover Cooling System Component YF1 43847 37 70 Overview When youre servicing a Yamaha water pump, the cover is one of those parts that has to seal perfectly or youll run into cooling issues fast. Ive seen pumps lose pressure just from a worn or slightly warped cover. The Yamaha Water Pump Cover YF1 43847 37 70 helps keep everything sealed and aligned so the pump can do its job properly. Its a simple part, but its critical for keeping