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its interesting how he mentions that the scooter begins to shake and jerk only whilst the fan is running. i ponder if a wire shorting out could cause the scoot to jerk and shake? for a test could you put your scoot on its center stand, and start the motor and let it idle for a long time. i would allow it to idle long enough to where the fan kicks in, when the fan kicks in, take note of the change in engine performance and sounds, also after taking a good note, then while the fan is running, give it gas. while you are giving it throttle, raise throttle to 3k and take note, then raise it to 4k and take note, and do that untill you almost red line and bring back results. i know it wont be very accurate because there is no load on the scooter due to it being on the center stand but this is just to get a first diagnosis.