New KLX250S Running issues HELP!!

So My girl friend bought a Kawasaki KLX250S brand new a few months back, it's Carburated, which i'm not fond of. We have not even put 1,000 miles on the bike yet and it's now giving us issues.
With the Choke off the bike won't start at all, turns over but refuses to start. With the Choke on the bike rolls over a few times and then fires right up.
-Now wether you wait 1 minute or 20 minutes for it to warm up, as soon as you turn the Choke off the bike will die.
-If you turn the Choke off but keep the throttle on a little it will stay running but as soon as you let off the throttle it dies.
-As your holding the throttle open slightly to keep it running and you try to quickly bump the throttle to rev. it up..... the rpms drop, it bogs down and the bike will /or try to die.

Does anyone have an idea of what the issue could be?? I don't mess with carbs to much to know really what i'm doing.
Could it be bad fuel?? Maybe air to fuel mixture?? I'm not sure. I figure everything would be set right from the dealer but then again I know how a lot of dealers run because I have worked at one before and not everything done at dealers is legit.

Anyone have any idea what it could be before I just go tearing into this thing?!?! Thank you for any help or ideas givin!

Sounds like a plugged pilot jet in the carb.  It's not getting enough fuel on the low end circuit, with the choke on your cutting down the air and allowing it to run with less fuel.  

Pull the pilot jet and clean it out (the metal is very soft and easily damaged....don't poke anything stiff like wire ext through the jet, a single strand of copper electrical wire will work).  Make sure you install a inline fuel filter when your done to prevent this in the future.

Hodakaguy

Fan-Frickin-Tastic my friend Sounds legit, even though I don't know what a pilot jet is lol I will definitely give that a try!!! If it works I'll owe you a brewski! I just have to do a little research to figure out what and where this pilot jet is in the carb. Lmao ooohh I'm so pathetic lol. Thank You for the assistance

My Gawd Man!!! After some quick research of what and where this pilot jet is iiiiiiiiiii just might see if it's still under warranty and make the dealship do it that way it's on them if it gets all screwy Lol I'll farkel with it today though and see what I can do...... Maybe a nice hard kick will get it blockage loose noooo I wouldn't really do that.

Outline procedure:

- remove carburetor from bike, protect opening into engine to make sure nothing crawls in there while the carb is off.
- remove bottom of carb
- be careful not to lose the float, float pivot pin, spring, and needle valve which could fall out
- remove pilot jet
- I prefer to replace the jet, they are only a couple of bucks and sometimes its' hard to clean them out
- Clean out the carb while you've got it open
- Reassemble carb, may need new gasket. good idea to buy stainless steel socket head screws to replace the phillips screws on the bottom of the carb. They will last through more remove/replace cycles before stripping out.
- Re-install into bike

On some bikes you can rotate the carb in place and work on it without fully removing from the bike. But if you haven't worked on a carb before, this is dangerous since it's hard to see how everything goes back together if something falls out.,..

To prevent this, drain the gas from the float bowl during storage and/or add gas stabilizer.

if you ride offroad you really should know what a pilot jet is and how to remedy this situation. it could leave you stranded at a very unfortunate time. there are lots of videos on youtube of how to dissemble pretty much anything on a bike that you can learn from.