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Impeller should be changed every 100 hours or annually... as MC puts it...Blockage of the transmission cooler or a faulty raw water impeller are too-frequent causes of overheating.
running it dry will cause vanes to where causing less water to be pumped into cooling jacket. Rubber against metal no water or lubricant...heat... Impeller - $35, Engine work/replace $3K - $10K, replacing impeller seasonally or every 100 which ever comes first and not worrying about it....pricelesss.
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 ...A bad day water skiing still beats a good day at work...1995 Pro Star 205.... 
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