Carburation issue?

[norbert]

Well, I googled Mrs. Schilling: a quite impressive personality

[MickeyMoto]

She was a motorcycle racer!

The BMW and Mercedes aero engines used fuel injection, the Rolls Royce used carburettors. It is always the simple ideas that help. I am glad modern bikes do not use carburettors!

[Steve Brown]

I know that it sounds strange. It' just a cheap way trying change the posicion of the holes of the atomizer. Nothing to Do with magic

This is a perfectly good idea in principle. Another way of achieving the same effect is to place a small shim under the throttle needle clip, so long as the shim thickness is less than the distance between the clip grooves on the needle you can get another small adjustment in needle/atomiser relation.
Placing the shim under the atomiser will also slightly adjust the relation of the atomiser metering holes and the float chamber fuel level.

My own bikes (Camel and 350 Sport) both responded well to altering the slide cutaway. Mine needed a larger cutaway to cure richness that I couldn't quite fix with the needle/atomiser.
The biggest improvement I ever had to carburation though, was by getting stronger sparks from the ignition system!