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I have a JC 266 Tritoon with a 5.7Gi-e and 1.51 SX-M upper unit. A mechanic at a local shop had put on a duoprop lower, but I’m sure he got the gear ratio that is needed wrong. At WOT I can maybe get to 4000 rpm. The boat used to run at a much higher rpm and at a higher top speed. I’ve tried...