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    25 Hp Kohler Gravely... black smoke under load.. loss of power??

    Newbie here... Hello all... I have a 60" Gravely with a 25HP Kohler on it.. The machine idles great, starts fine..ect... But when you start mowing and cut more than 1/2 in it starts to bog down... IF you cut a bit more than that you start to see the big black cloud.... I hate throwing parts...
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