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    Best Prop diameter/pitch for 1997 counter rotating Suzuki DT 150's on a 25ft Seacat.

    Bought used 1997 Seacat w 1997 DT 150's good compression 135-140psi on all cylinders.Came with wrong props, engines turn up 5500-6000 ,no problem ,but the boat is only moving at 10-15 knots. any advice/formulas? How do I know if the hubs are spun ?
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