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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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I think you would be fine running the 38mm carb. Jetting should be real close to the 40mm. How is the bike running? If you wanted the stock 40mm your best is ebay. Other options could be a 39mm Keihin pkw.

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