Honda Sh 150 drives into the limiter

Hello Community, My Honda Sh 150 drives according to Tacho exactly 120 km/h, then it goes into the limiter. Also at 9/10 gas. Therefore my questions: 1) knows someone whether that is one km/h limit (electronic?) or a speed limit 2) if speed limit, there is a possibility (other vario, other translation, that it does not run in the limiter? Tuning is meant Only legal means please. 3) you (I) at the vario can actively change what (translation ratio) so that he d he speed lowers and thus also faster than Tacho 120 runs. Some stupid on the highway to overtake a truck and then to be caught up by stuttering.