ORIGINAL: jester_s1

A lot of needle issues are cause by air leaks at the carburetor. That's not a Super Tigre specific issue, but it does seem that they a touch more prone to it. If there is a leak, it changes the calibration of your needles. You wind up having to go richer on the top that you should, which means that a proper idle setting gets too rich. So then you lean the idle to run right which changes the timing of the needle's withdrawal from the spraybar, which is what controls the midrange. Such an engine will run right on the top and the bottom, but have issues in the middle. Obviously not every problem with an engine is caused by an air leak, but it is something to consider when tweaking the needles just doesn't seem to work like it should.