ttr 90 carb swap

I am trying to swap carb because it is not feesible to repair.

costs less to replace than repair, not going through yamaha.

what can i get away with 20mm,22mm,or even an 24mm.

have found several 22mm mikuni nice carbs of course they will do away with the choke cable and relocate it to the carb.

any suggestions.

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