No - that is, not the prewar Yorktown (CV-5 - the one that was sunk at the Battle of Midway).
Tamiya makes 1/700 models of both of the Yorktown's sister-ships, the Enterprise (CV-6) and the Hornet (CV-8). They aren't bad kits; when they were originally issued, in the seventies, they represented the state of the art. (Both of them suffer from one error of accuracy that I personally think is pretty conspicuous: their islands are too skinny. Other Forum participants have pointed out other, lesser goofs in them. But lots of people find them nice, well-produced representations of the real ships.) Trumpeter also makes a 1/700 Hornet. I haven't seen it outside the box, but I understand it's more accurate than the Tamiya version.
Hasegawa does make a 1/700 version of the "new" Yorktown (CV-10 - the Essex-class ship that's preserved at Charleston). It, frankly, is showing its age pretty conspicuously. Anybody wanting to build an Essex-class ship in WWII (or early postwar) configuration would be well advised to consider the kits from Trumpeter and DML. Trumpeter has a 1/700 Yorktown (CV-10). There's some argument as to whether the Trumpeter or DML kits are better; everybody seems to be that both are excellent.
It seems odd that the old Yorktown (CV-5) has attracted so little attention from the kit manufacturers. There are quite a few kits representing the other two members of the class in various scales, but the only one sold as the Yorktown, so far as I can remember, is the old Revell one.
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