Hey together, ride a Tgb Bullet 50RR, 2013. The scooter always ran top, had a train and came to a final speed of 65 kmh. But now at 58kmh is the end! The scooter turns when starting up higher as usual, and takes longer until it is at final speed. I have already changed/cleaned/ and renewed a lot. There are no tuning kits installed!!! New is the spark plug, clutch, the suction nozzle, V-belts and weights. Air filter is not the latest but looks okay, The scooter has no drop-outs, and after 30 seconds of driving, it stands well at 2200 u/min at the traffic light. I also sealed the exhaust at Krummer and connection to the pot with Gum Gum. Oh yes the converter is also used New. Hope someone can help me to have fun again. And please no information that the scooter is going too fast anyway and …….think you know what I mean. Mfg SL