For some reason a guy made a thread on how to "de-restrict" the Dt125rs
Some were correct but made 3 mistakes
Remove the boost bottle on airbox to carb hose and bung it.
Blank off y.e.i.s. On inlet manifold.
Cut off the airflow guide on the inlet manifold. (the part that sits inside the reed block.
This has misinformed many people, so many previous owners of your DTs have been messed about with.