Per Merc, the WOT range for your motor is 4800-5200 so if you were lightly loaded you should probably go down in pitch (if you have a 17 now go to a 15). Or you can try a completely different style of prop and see what happens depending if you are looking for top speed, cruising speed, economy, etc.
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1978 SeaCraft Seavette/Mercruiser 502
2007 Key West 1720CC/Yamaha 90
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