Глушитель скутера промывка химией

More than 10 years ago I did this flushing procedure, now I repeat it again. But as practice has shown, the second time, the muffler was very clogged, so there were additional procedures that I filmed in the second part of the video. Now when I increase the gas, the scooter tries to break out from under me. What symptoms the mechanics did not talk about, only one experienced mechanic insisted that the muffler was clogged, which I did not want to believe.