It is true that the scoot idles and starts just fine and 45-55 mph is just ducky!
Well, that settles it - you're going to need one of these, a Flux Capacitor.
Remove the seat bucket and it is located right here, next to the coil...
Pull it straight towards Taiwan and then turn it, I forget, either left or right -
ONLY !$13.99 eBay- with free shipping.
Best to use remote start only, the first few times.
Then you should be OK.
Karl or I can provide your dealer with video if needed.
Stig