Looks like the main jet is a little rich. Acceleration is usually controlled mostly by the idle circuit and the knurled headed adjustment/screw needle which is usually found near the the top of the carburetor close to the outlet. This is often referred to as the low speed circuit adjustment also. There are usually 2 or 3 tiny holes in the carburetor body that are near the throttle butterfly. There may be at least one on the engine side of the butterfly to provide fuel for idle when the shutter is close. Air flow through the venturi will be very little at low speeds. As the engine starts accelerating these little holes provide fuel for that since there is not an acceleration pump or well provided. These holes are very small and are different sizes and most require a very small wire like a bread wrapper tie wire to clean out and are many times missed when cleaning the carburetor out. You should check them and if they are open you can spray cleaner or something into the idle adjusting screw hole and see it come out the tiny holes. The idle circuit needs to be adjusted correctly for both the idle speed and mixture. As you adjust the idle speed it will also change the main jet setting some so they need to both be adjusted probably several times to get it right. These adjustments are related and often one will affect the other one slightly. Most idle circuits run 1 &1/2 to 2 &1/2 turns open when correctly adjusted. This is not absolute truth though and yours may vary but the instruction manual should give an approximate setting for both. The main jet is best adjusted under a load.
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