[mdopole]

I had that on mine when I rebuilt it. It turned out to be the valves. Make sure you put it on the right mark when you adjust them theres a "t" then an "f" notch on the flywheel and another "t" 180 out. put it on the "t" thats before the "f". . It still ran decent but when I adjusted them properly it was night and day! Until my intake valve stem broke......haha