MOPED ARMY

So are u even able to replace the needle jet because it looks like they are pressed in and also i heard that another difference between the 2 is the jet needle has a more intense tapper than a 4 stroke needle. I am looking to try to convert a 4stroke carb to a 2 stroke but trying to find the right needle jet and jet needle is turning out to be a lot harder than it seams especially for the smaller 16 and 18mm carbs.