Do you know where the flasher location on the scooter would be?
The flasher is located under the front cowl but there is a good chance that you would not have to remove the body to access it. After removing the windshield there is a small panel that is is accessible and you can see the top of the flasher relay - I don't have access to my scooter at the moment so I can not check to see if it can be disconnected through this hole or not. Note in the diagram below it is called the "Winker relay":
You can see the top of flasher (round item) in the lower right just inside the opening (there are two black square relays shown in this photo that you will not have - they are part of my custom light wiring):
And here is the printing shown on top of the flasher relay on my USA-spec 2011 DT300i:
I don't know if most of the folks adding LED turn signals have USA-spec bikes with the front signals installed in the mirrors or Europe/Asian models.. On our US spec bikes it appears that possibly the signal mirrors have resisters built into them. After adding LED signal bulbs to my bike the signals worked normally until I disconnected the front signal mirrors from the circuit and then I had the rapid flash rate and the signals were not going all the way off, they would stay on at half brightness.
Please note that I am not using the LED bulbs listed in this thread - I'm using the products from V-LEDs. (I will be listing the exact bulb models, etc in a future write-up when I get back from out of town)
Also, when changing out the rear tail/brake light, be sure to order a red LED bulb for use behind the red plastic lens housing. (Red LED behind red lens, amber LED behind amber lens, and whatever color you need/require behind a clear lens for example amber for our turn signals)
The bulb research by "Whispers" above is correct: the headlight is H8 for both low/high, tail/stop is 1157, and the turn signals are BAU15S.
Brent