Now that's better! I can understand what you said!
IF there is a rev limiter, it will just hold the RPMs to a certain amount, it will not "shut down", that is a whole other matter.
You might want to inquire on the scoot dawg forum, there are a lot of folks there who do all kinds of mods and repairs, and I am certain you will get the right direction to look in from them.
As far as 120 KM, that is 74 MPH (GPS, not Chinometer) and I REALLY don't think the 200S can come close to that.
There is a fellow on the SYM forum who did mods on the HD 200, which hits about that 74 MPH speed out of the box (but water cooled, 4 valve engine with ceramic one piece cylinder and 4 more HP than the People S). He did the exhaust, air box, jet AND a no limit CDI. He can hit 85 MPH GPS, but only for around 10 minutes then it starts to overheat - the cooling system can not handle it.
Being a People S 200 rider, I just don't see anything more than maybe 65 being squeezed out of it. YMMV