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1984 YZ490 Carburetor options

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Hi all,

I picked up a 1984 YZ490 recently and i found out that the carb on the bike has been swapped back in the 80s from genuine 40mm to 38mm mikuni VM. I am thinking of turning it into a vintage mx race bike  and should i keep this carburetor? if so, what jetting would be suitable for it? If not, what are the options i have to replace the current 38mm on the 490??

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