150Mv is the base setting (screws all out) , you need to raise it up to (525mv?) once the throttles are hooked up then adjust the air screws and sync.
so just set your stop screw to 525 with key on not running, then fine tune with air bleed screws.. start bike and sync TB's above idle, 3k rpm and then go back to readjust/balance the idle with the air bleed screws.