Yea they do. If you run too many rpms your rev limiter will hit. My rev limiter kicks in at 6200 rpm. With a 14p black yammy prop I can hit the rev limiter empty and with a load I can run right at 6000 rpm and that's where my motor runs best and best on fuel. I have a tohatsu 40. But I had a merc 40. The powertech from what I understand is a cheap imitation of the yamaha prop. It's heavier and don't run near like a yamaha prop. Cajun Christian can tell you more about it than I can.
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