The leak around your needle valve should tell you something. Check that are closely. When the engine gets under load, the leak at the needle is allowing air to get into the carb thus killing the engine.

Have you had any hard landings lately? You should also check the clunk in your tank to make sure it is not bent forward. If it is, the engine will die because as it picks up speed and the fuel goes to the back of the tank, the clunk only picks up air.

Rich

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