Hi guys, I need your advice or help. Advance to the scooter: Baotian 4 clock BT49QT-20A (or trade name 20B according to vehicle papers) The following situation: My scooter gets on long distances at the moment the problem that it loses speed. I drive with full throttle on the country road my 55 km/h. After about 10 minutes the wind starts to fall, slowly but steadily. How deep I have never tried exactly, I then let go of the gas for a few seconds, the speed is of course, at about 40 km/h I give full gas again and reach the speed of approx. 55 km/h without any problems, until a few minutes later the same Scenario starts. I experimented with lighter weights in between, with 5.5g – 6g weights the problem appears faster. I also noticed that the engine sometimes sounds different at full gas and behaves differently: If the Scenario enters as described above and I then the gas w It sometimes happens that the engine speed changes according to hearing, it then drives about 56 loud tacho and sounds “constanter” from the speed, maybe even 300-600 rpm higher (unfortunately no tachometer). I also tried to watch out for the engine noise at “normal” 55 km/h, it doesn’t sound as symmetrical / constant as described in the situation. Definitely not a completely worse run, but just not quite so nice. ön. The pulsed light speed increase is already noticeable, somehow the scooter then seems to run a ticking better, is just difficult to describe. I found a post via Google on another forum where the problem was also described, there created a hotter spark plug aid (higher heat value). My current is a NGK CR7HSA Had already the CDI /Zündstecker (45 km/h without speed sensor, but according to forums still no maximum speed bereic h) in suspicion. Maybe the exhaust makes the problems? Do you have tips or recommendations for me on how to turn off the problem? Maybe someone knows the problem? Greetings!