The fuel screw definitely needs to be adjusted on the 2001+ carbs and it is hard to reach.  This screw will make the job effortless and toolless.  Fits 2001 and newer TW200.  Requires that you have already drilled the fuel screw cover.  Will also work on the Chinese copy carbs but the spring is slightly short, so we recommend using the washer and O-ring from you OEM screw underneath the spring to add some spring tension and prevent rotation.