Hello, I went to a colleague without any problems, on the way back My scooter then started with the problem. And indeed if I give little gas is no problem then he also comes on his 55 (tacho) but as soon as I give a little more than half he comes up to 40 and then suddenly he gets louder and goes out almost . Then I let go of gas and give a little then again what can be all this original still 6000km Speedfight 4 AC 2T 6000km Thank you in advance Ps. Weights are ok Not angular