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When accelerating slow in low range the engine will start to sputter at about 5miles per hour.It feels like it isn't getting enough fuel or running out of gas.The machine starts and idles perfect.After the flat spot the performance is great.I have 10 thousand miles on the machine.I have changed the sparkplug and it didn't make a difference.Any thoughts on this?
 

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Might be time to put a rebuild kit in the carb and clean it well. The needle jet and jet needle will wear over time as they contact each other opening and closing the throttle. At 10K I would suspect that as the first issue.
 

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Has it been doing this since the rebuild? If it's a new problem you might try running some Seafoam thru it and see if it helps.
 
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