Sounds like you have a governor issue. Maybe it is out of adjustment because of a weak spring? How many hours?
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1572, 1864 x2, 1810 x2, 1863 & GT1554(Dad's Ole Mowers), 1811,782D, 1872 x2, 782DT(Sold), 3235, 1860, 1772 with 3-point and Turbo.
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