Could be a stator, however seems lately I am getting equiptment in my shop somebody found a great deal on but it either don't run or runs poorly.I have worked on 2 buggies and 1 2 cycle atv which had no top end at all. The buggies had the same problem for they would idle fine and even ran well at low throttle but put the pedal to the metal and they would fall on their butt. One turned out to have massive dobber nests in the muffler the other had a rats nest in the muffler. The 2 cycle would not run at all with exhaust attached it also was plugged with dobber nests. These had all sat up for a couple years in some out building. All you have to do is loosen the exhaust at the head and try to accelorate, if it runs you know the muffler is plugged. Easy and takes no time to check.
TOM
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