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It's not very probable that you'd wear out a needle jet in 2K miles.
The next things I'd look at would be to check for loose jets, for dirt in the float bowls and leaking/soggy floats. Loose jets cause rich running (until they fall out) as will grit in a needle valve seat or a 'heavy' float raising the fuel level too high.
Another possibility is that there's a piece of dirt in one of the air jets at the front of the carb. That will richen the mixture also.
I can't help you on the Mikuni parts, but perhaps if you start a new thread someone can provide that information.
Jim
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