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    Prop for repower 247 with f250

    I am repowering my 2002 247 grady advance with a four stroke 250 yamaha. Has anyone done this and if so can you recommend what prop. Grady White sent me the performance sheet for the 257 advance with same power. It has a 15 1/2 x 17 3 blade SS prop. I am interested if I need a pitch 19 on...