I had very similar problem with my 3AJ, run sweet at low revs but open the throttle suddenly and it went very fluffy. Stripped and cleaned carbs, adjusted the secondary carb opening screw ( the one that opens second carb at higher throttle speed ) but I think the main cause was that some inline fuel filters I had fitted had broken up and filled the fuel pump with the remains, small bits of filter paper. Cleaned this out and was running perfect. Worth a try.
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rust & dust
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