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    Prop question for 1988 Yamaha 30 HP

    My old prop is marked 9 7/8x13 F, one prop listing makes mention that when changing from a flat prop to a cupped model reduce pitch by 2". Is the "F" mark refering to flat? One catalog lists several different pitches but are 10 1/4" while another shows 10 1/8". <br /><br />Boat is 16' Alu with...
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    Yamaha 88 30ELG 6J8L453113

    Runs but without power. Pull plugs after a run and they are wet and black. Plugs, carbs and fuel pump are new also. Engine run in lake on trailer, timing steady and at proper advance on all three cylinders. Ohms of coils under flywheel are in spec of Seloc manual. Starts getting way out of spec...
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