Roller(Jmstar JSD50QT-13, 4 beat, 50ccm): Gas acceptance problems

Hello dear forum, I’m completely perplexed, so here’s my first entry at all in a forum: The problems have started so that the scooter suddenly went out while giving gas instead of speeding up. I’ve been doing a lot of things since. The symptoms have changed, suddenly he took gas, but only up to 10-15 km/h. If I give more gas, he wants to go out. Why could I avoid the problem by putting on the rear brake LIGHT. That’s of course not the problem solution and doesn’t work any more anyway, but maybe someone knows what it might have to do with it. For me that makes absolutely no sense. So far I have done and checked the following: -Air filter completely cleaned and checked for leaks. -Carburettor completely new (I also tried to make carburettor settings, however, no difference) -Benzine filter fetched -Benzine supply checked -Underpressure checked -CDI checked -Ansa ugstutzen checked (looked pretty good, but I still think I’ll get a new one to see if that changes and I really don’t have any idea what else it might be) -new spark plug hoses checked for leaks – cabling checked The scooter always jumped in normal (speed changed in the stand gas, which is why I actually started out of wrong air).Currently: scooter no longer starts sovereign, only on ach and krach and gas he takes a I really hope that this forum entry can help me.