barco made "blue impellers" that were not suposed to burn up, hte EPA put them out of business. I rarely see a worn out impeller, usually i see a burnt one from running it dry. The small diameter mercs are bad about knocking the blades off though, especially if it sat up for a while. The harbor taxi has 2000 hours on their impellers when they let me change them(they were just over a year old)
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