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Mako 21' 225 Yamaha correct propeller sizing

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  • Mako 21' 225 Yamaha correct propeller sizing

    Dear Mako friends, have a 1982 21' CC powered by a 225 2-stroke Yamaha. Motor propeller came with the outboard so there wasn't much research applied to correct sizing. Performance seemed to be good until yesterday when we took 4 additional peeps on the boat adding ~800-850 lbs to vessel. Those I was finally able to get her up on a plane, I need to maint her @ ~5500 rpm to sustain the ride. Have looked at other boats with similar rig and my prop definitely appears smaller in size. Most probably prop is undersized. Can some give me an idea where I should be sized.
    thanks

  • #2
    Need to know what you have to give you an idea where to go?.
    '90 Tuppens 231 Polk City, FL

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