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Has to be a fuel pick-up issue if it’s happening with three carbs.
Fuel pick up system:
– Pulse fitting (could be affected by reeds, or crank-case sealing)
– fuel pump
– feed/pick-up line
– Pump-to-carb/return line.
Have you restricted the fuel-pump return hose with a zip tie or clamp?
can you post a photo of the fuel line circuit?
Does the problem occur on left and right sweepers?