The water pump impeller is the rubber part that moves cooling water through an outboard, and it wears whether the motor is run or stored. A worn impeller is the most common cause of an overheat alarm. A repair kit includes the impeller plus the gaskets, seals and (where the maker specifies) the housing or wear plate needed to do the job once.
These are genuine Honda Marine water pump repair kits for BF outboards, ordered by model. Follow the impeller interval in your Honda owner's manual, and replace the impeller any time the motor has been run dry or has picked up sand.
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