Are both fuel tank valves fully open? On my 1864 when the fuel tank was low, the engine would want to surge, die under load. I was using only the left tank valve and it was major plugged. I removed fuel tank, cleaned tank and both valves, replaced complete fuel hose and fuel filter. No further issues.
If your fuel system has never been serviced, it's due.
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1863, 1864, 48" and 54" mower decks, 54" snow plow, 451 snow blower, TracVac 580
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