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Adjusting the needle at the bottom of the carburetor should have helped you out a little. Since it did not you are going to need to clean out the carburetor very thoroughly and rebuild it with a new carb kit, and then dial it in. Both of the adjustment screws should be set at 1 1/2 turns out from lightly seated as an initial setting.
If you can get me the model, type and code number off the engine I should be able to come up with a write up for dissasembling your carburetor
This is the location of where to find these numbers.