in addition to the bolt on the water pump housing jdoni pictured there is one for the upper cylinder housing as well that needs to be drained. its located on the left side just above the overflow tank. both need to be removed and drained. put back in. filled with distilled water. ran up to temp. both drained again. finally filled with
"Pro Honda HP Coolant or an equivalent high quality
ethylene glycol antifreeze containing corrosion
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