Colder left cylinder

[teazer]

Had an RD350 on the dyno a while ago that was leaner one side than the other and the carbs were perfect, so we swapped out a pilot jet to one size larger on the lean side and everything was fine all the way through the rev range.

We have to remember that jets are sized with a number but they actually fall within a range of flows, so one might be at the fat end of the tolerance or may flow more fuel that it should. 

Are the jets new and are the pilot air screws absolutely identical? There may be slight differences.