First thing I'd do is check the ignition timing. Also the verify the centrifugal advance is working. (Timing at idle can be right on, but if the centrifugal is stuck timing can be off by 30 deg or more at governed RPM. This will rob a LOT of power.)
Next check the carb power mixture. If the carb has a high speed mixture screws turn it OUT 1/2 turn at a time and see if this helps. Or if the carb has a fixed high speed mixture, try gradually pulling the choke while under load. If you get a bit more power with the choke slightly closed, the carb needs attention.
Finally check/adjust the valve lash with the engine warm.
If none the above gives no improvement there's a more serious problem going on (low compression, etc).
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Today's Featured Article - Show Coverage: Godfrey, Illinois Country Days - by Cindy Ladage. Except for last fourth of July's Old Gold show in Springfield, Illinois, I don't remember when it was so hot. Nevertheless, the heat didn't keep vendors and visitors alike from enjoying the third annual Country Day's Event. Jane Elliott said the event was originally a one man show. "Barry Seiler, owner of Country Town Farm Supply store used to invite people up to the Johne Deere store. He would give hats and a free meal for everyone that brings a tractor." Elliott said while this
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