Just bought a 24' North River hard top with twin Merc 115 EFI Saltwater 4-strokes. It came with 13x19 props but only turns 4800.Dealer recommened 13x17,still turned 4800,but lost top end speed. One tach was 200 rpm slow ,but the other was right on. It is an aluminum boat with 120 gal. fuel.Both...
