We bought the boat last September so we haven't had a lot of use of it thus far. PO said he put in a new one last spring. I did other things this spring to maintain and improve the engine; the impeller is the one remaining bit of ordinary maintenance. Last Saturday water out the exhaust at all engine speeds was ample and appropriate. I like the idea of removing it in the fall so as to allow the fins to relax, but once having taken it out, why not replace it with a new one, it being just as much work to put back the old one as to replace it with a new one. That's what I think I'll do in the future. As for now, I'll replace it soon, definitely before our cruise downeast in August.
Mark S
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