my Ninja 300 with ABS does the exact same thing...and the 'light staying on' is a common question on the Ninja 300 forum. Normal on the Ninja and probably normal on your scoot, too. I'm sure another S150i owner will chime in to confirm.
My first ABS experience was the day they delivered my new Burgman 400. He rolled it out of the trailer and up the drive - we both remarked on how heavy it was! (@500lbs) (he hadn't put it in the trailer)
Looked it over - signed the papers, gave him the check, etc.
I started it and, "
hello? what's with the ABS light on!?"
He used his phone to call the dealer the other side of Ohio.
"The light will go out when speedo shows @10-15MPH.
Normal!"It did. Pretty exciting there for about 2 mins!
My Liberty does the same.
Stig