Have now tried to jet down a bit. Tried a 56 first, then a 54. Pretty much runs the same.
But here is a video of the drivetrain under load. Holding the back wheel down while it’s on the stand and giving it full throttle. Is it normal that it is this dull?
And it also chews belts. This a Malossi belt i bought last week. Moped have only been tested and maybe gone 1km with it. See picture below.