This is my first posting so please bear with me. My x2 is very hard to start, which from what I understand is normal during break in. However, my bike will run with the choke all the way on, but not well. Then when I try to take the choke off it wants to die. I think the problem is in the a/f screw setting but I am not sure if it is running rich or lean. Any help would be appreciated. It is a stock carb.