For all my friends that are flying with a Yamaha engine that are concerned with OEM water pump failures. I messaged Steve Henry, pilot of the "Hee Haw" STOL airplane. He is using the 3 cyl. Yamaha. My friend Kurt Carlsen spoke with him at Air Venture. Steve is using two electric water pumps in line, one for back up one as the primary. He has taken the impeller of the shaft of the OEM pump and simply put it back together.
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