It looks like the post worked this time.
I also swapped the main jet to suit the new muffler, and Pastor Jim reports that it woke up the scooter nicely. He can easily cruise on the freeway, although I cautioned him to stay off of it until he gets a bigger scoot. He's eyeing up a 400 Burgman now.
Those who have been following might remember that he started with an electric scooter, sold that and bought a 50cc Saga and sold that and bought the 250. He's loving this means of getting around.