engine breaking up at wot

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kcollier

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henderson nc us
has anyone had this problem.i have the xcan on my 26cc engine,at wide open throttle the engine breaks up,it will not wind up.i have a new 813 carb,new coil,new plug,have checked for air leaks,and tuned for hrs.does anyone have any ideas what this could be.
 
I had two of the new hy engines do this. Did everything to fix it, changed carb, gaskets, pipe, still same thing. So I tried the thinnest copper gasket. Since I changed it no more problems. So all I can think was the compression just wasn't there.
 
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