Roller Jetforce C-Tech

Hello, I have bought a Jetforce C-Tech from 2014. The engine is newly installed by the dealer. My problem is that the scooter takes a really long time to get started. Where could it be throttled? I got a ring out of the Vario. The scooter was not throttled to 25kmh but to 45kmh. What can I do so that I have more power without buying anything. Would like to buy a sports exhaust next month. Link: Exhaust System Stage6 Pr o Replica MK2 Orange Peugeot lying / Morini buy – SCOOTER-ATTACK . Because I would then also remove it. Brings what’s in performance or there is better in the price range. ps: I add a few pictures from the Vario. Sincerely Justin