Have you tried this?
Locate the area where the gas hose connects to the carburetor. There should be a "bowl"
With a screw in its bottom. This is a nettle valve which regulates the flow of gas into the float compartment.
With the engine running at near medium speed, turn this screw CCW 1/4 turn. This should allow more gas to be supplied to the carburetor.
When you re-built the carburetor, you may have changed the setting of this screw.
Let me know if this works.
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