Weird noise from carb on EX...

[RiPPiNiTuP7]

Maybe I am just hearing things, but when my EX is cold, and I start it up you can hear a "thunk" kind of noise from the carb. Once my quad is warmed up, you never hear it again...just on startups. Is it normal or what?

when you first start it up does it kinda die out then u hear that noise then it is ok cuz mine does that i dunno what it is but mine also leaks fuel when it is first getting warkmed up only when its moving though