Honda 400ex carb trouble

Yes the quad I’m workin on has a k&n filter on it .. with the air box lid on it .. I live at 640 ft elevation... and the exhaust it has on is a called a xcellerater by dg performance.. not sure if it was jus a slip on.. but I took the carb apart n cleaned it .. seemed like it was pretty clean.. all except the overflow in bowl of the carb was jammed but I got that fixed

I have a video of it running .. but I don’t kno how to post it .. also it idles decent wen I flip the choke on a little bit

http://www.youtube.com/watch?v=rABO1b6VEZ8



Thers the link of it running ...it jus stutters really bad until I turned the choke on a lil n then it runs decent

I’m not sure what kinda jets it’s got in it either cause they don’t say anythin on em

Ok thanks guys ... I have a rebuild kit on the way but I cleaned the carb ... and everything looked free n clear .. another thing I noticed on the bike .. when u hit the throttle .. about 1/2 to 3/4 throttle the throttle wants to kinda bounce ...or like vibrate