First the symptoms...
It will start right up
The idle is choppy but it will continue to on the stand
Throttle response on the center stand is good.
When I ride the scooter, it accelerates well but it will buck and hesitate when I back off the throttle.
Once this starts, I can pull in the clutch lever but the scooter still wants to cut out and die, unless I go to past half throttle and basically rev the motor.
By the time I get the scooter back home, it won't stay running anymore..
What I've tried so far...
New spaco 24-24 carb, main stack 160-BE3-118, idle jet 55/160
Set the mixture screw 3 turns out, and 2 turns, etc, etc
Set the timing with a timing wheel and gun, scooter fires at 24 degrees before TDC
Spark plug looks black
Tried a different idle jet
Checked compression, it's only 90 psi
Ran w/o air filter
The scooter has a scored rotary pad, but I don't think that's the problem.
Running out of ideas, not sure what to try next.
Video to follow.