Hi,
I just own a NSR125R but the so called "Auslasssteuerung" is for the engine exit. If you choose "low" you have a good performance from 0 to 7000up/m but over 8000up/m there is nothing. If you choose High you doesnt have good speed under 8000up/m but after 8k up/m you get the speed you need.

Normaly the Auslasssteuerung is managed by a blackbox but if you turn this off you can set the high/low settings.

A explanation in german from my Webpage (use google or so for a translation):
Go to http://www.thundercloud.info/nsr/?s=info and choose "Unterschiede anden Auslasssteuerungen (TV78/TV124)" and click on "Los gehts".

Have phun,
Stefan