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You will need to do some "plug chops" to find the real problem.
My guess is that either the carb needle is too low (lean in mid-range) or that the main jet is too small.
To do the chops, you run it up to a specific rpm range and without letting off the throttle, hit the kill switch and brake to a stop while holding the throttle in the position it was running at.
Check the plug color then and make adjustments as needed.
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