bike cannot idle or stay on for long, help

[motorized kodiak]

hey everyone, i think this is a carby problem, my bike cannot idle at a normal rpm without dying, i think i have huge air leak some where because the bike takes like 3 -5 seconds to go back to normal idle, and i also still have that carby leak. so what i done was i ordered a new carby this is the one i ordered. http://www.ebay.com.au/itm/281153284...84.m1439.l2649

what do you guys think? and any help with my issue will be appreciated! thanks