First the clip holds the needle so when the slide moves uo so will the needle. If the needle does not move with the slide the problem you describe is caused by the missing clip. In most cases on a stock engine when eliminating the air box and replacing with a UNI or like and the exhaust has been opened up for better breathing the main jet would be a 125. But might not be correct for your location. The numbers stamped on the jets represent not a size but flow. So by drilling the jet you will have no way of telling how rich your going.
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