in gear and it dies sounds lean. Choked richens the mix (higher vacuum from the choke restrictions) and off idle its back to lean. Unscrew the mixture screw 1/2 turn and see if there is any difference. If not turn it back, it’s free. Another Gotcha is the fuel filter: if its horizontal, it can generate an air pocket at its highest point that will prevent the bowl from filling when it gets warm, leaning out the carb (again, lean). Both free to check. If it happens on both carbs, it’s probably not the carb. but check your accelerator pump shot to be sure it’s not something easy.
