hi my bike 01 ex has been giving me a problem after taking it to different bike shops 2weeks later still not running so tonite i took it apart and found what appears to be a vacuum line off the carb ,one end to carb other supposed to go somewhere cant figure it out. when i put my finger over it my bikes runs perfect ,i looked on line to see where it went cant find anything....can anyone help me thanx

 

Its posible its the line to the anti air valve,
http://images.powersportsnetwork.com/fiche/images/Honda/2001/ATVs/2853_CARBURETOR.gif
Which is #28 in the view, which is under the black plastic cover, #22