I did mine aprox 2/3 of the entire needle lengh but i also turn the fuel off every time i shut down for the day other wise i might run the risk if draining the tank out.
thats what i did and it works for me i also have a set of Minuki Flatslide with a 330main i think that they are a stock size b/c they work with the stock air box/and intakes. i really dont know they were on there when i bought it.