Peugeot Jetforce turns too high

Hello, I have a problem with my son’s Peugeot Jetforce scooter. The scooter was equipped with an electronic throttle, which has now been removed (45 throttle disc is inside). On the scooter everything is still original, except for a Tecnigas Silent Pro exhaust (the throttle funnel is still inside). My problem is that the scooter with the 45 throttle disc is overturned. If I remove the 45 throttle disc, the speed is optimal. However, it also runs 75 km/h. the scooter is installed, but even with it the scooter overturns. What can I do “legally” so that the scooter with a 45 throttle is not overturned and not too fast? Speed limiter I do not want, since not legally. Someone’s idea ?