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I have a 200 Yamaha HPDI, it had a 15 x 15 stainless prop when I bought it used, wasn't the right prop at all, rpms were too high, so I have switched to 14x 19 aluminum 3 blade, also just bought a 14 x 19 stainless 3 blade toward end of summer, top speed with both new props 48 mph on the gps, rpms around 5200, which is perfect, also haven't experienced cavitation at all, but then again I don't really horse it around tight turns at top speeds, mostly use boat for fishing.
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