4 bar scooter weakens.

Good morning, everyone. Got a 4-stroke scooter, Razory R01 (Benzhou yy50qt-31-00, which stood 2 -3 years in the garage. He ran just 2600 km. What was done after the pickup of the scooter : New gas train, because it was jammed by corrosion, New spark plug, since the old spark plug was no longer spark, Carburettor cleaned, New gasoline. New gas filter. New V-belt The problem is : When it is cold, it only deals with start pilot. When it is on then listens the E-Choke has worked, because after a few seconds the idle speed is down and the stationary gas is actually well set. It takes an eternity until it reaches its final speed (45km/h) It reacts very lamely to giving gas, that means, for example, if I turn up gas completely immediately during the journey, you will soon fall asleep until it reacts. The suit is also not what it should be. According to Info Blatt, 6.5g weights are original installed. say where is the mistake ? Greeting Chris