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Here is what I'm working with 15hp Johnson on a 14' jon boat. With 9 1/4x10 prop at WOT its 4750 rpm. Using a 91/4x5 at WOT its doing 6750. Service manual calls for 5500-6500 rpm range. These test are with a loaded boat. Me, son, lot of fishing gear plus newly added front deck. What...

=D> 1980 Monarch 14ft x 48in short transom 15in 8) 1980 15HP Johnson with 9 1/2 x 10 prop (what it came with from manufacture) short shaft 15in :cry: Mini Jacker provides 3in lift :x So that puts my anti-cavitation plate 1/2in above keel. So what went wrong. Today think I had a blowout...