Have you checked the operation of the power valve? If the parts are not cleaned periodically, they can be tough to remove, so someone may have just opted to deactivate the system when they could not get the parts out to clean.
Just a thought. I can't think of ANY good reason to deactivate the power valve. Depending upon the static position of the power valve, bottom end will be really sad, with a big hit in the middle, or top end will be awful. If you are having trouble spanking a 125, your power valves are most likely in the closed position.
The first time you ride her with the power vavle fixed, hang on...
Rick