 Check your governor, see if it is adjusted correctly. Might check the timing. Is the fuel flow from the tank to the carb good or might there be an obstruction? Is the throttle shaft tight or does it have a lot of wiggle back and forth?
Just some things off the top of my head.
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DWayne
1973: 128, ag tires, 3pt. lift, spring assist, lights, 42" Deck
10" moldboard plow
2016 XT1 42" deck 18HP
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