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Probably an 18mm, measure ID of the throat on your old one. Lots of carbs available in the $20 - $25 range.....just search 'GY6 50cc carb'. Don't get sucked into high performance, racing, etc., etc.... It is all bull poo.
The problem you described with your old carb, is a classic sign of too much main jet. Bigger is not always better.
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