1996 Kawasaki 800B Vulcan classic keihin CVK G200 Carb. Bike always started not using the choke and run perfect. Parked the bike overnight, went to start the bike next morning, fired up an immediately died. I used the choke the engine finally started. Used the bike it started as it always did every time I started it. Parked the bike overnight, next morning fired up an immediately died. Used the choke the engine would not start. I removed air filter cover squirted a little gas into the carb., the engine started ran a little rough for a short time then ran like is always did. Engine started every time as if there was no problem. Carb is so lean the engine will not increase in RPM smoothly and run properly without the air filter and air filter cover installed. I have removed and cleaned all the internal carburetor parts. Used wire to insure all orifices in the carb body were not restricted. Fuel is running freely to the carb. A little help will be welcome.

SOURCE: klx 110 2006 stalls when choke is pushed in

i'd say the carb is gummed up especially the pilot jet (#16158) in this pic of the USA carb. may have to remove the carb & bowl and then remove the pilot jet (w/ flat head screw driver) and clean out the tiny holes.

http://partsfinder.onlinemicrofiche.com/atlanticcycleandpower/Kawasaki_OEM/KawasakiDB.asp?Type=18&A=39&B=17&Action=O

-OR-

the carb slide is installed backwards (turned 180 degrees). its #16025 in the pic. i've done this before on my daughter's XR70 and Z50. you'll know if its this when you move the choke lever, RPMs increase and decrease.

hope this worked for you and was fast enough.

SOURCE: Kawasaki Vulcan VN400 carb diaphragm broken

If you are really stapped on cash napa auto parts has some heavy duty rubber spray. Just spray a thin layer over both sides of the diaphragm to repair any holes/tears and let dry overnight. My diaphragm was going to cost over $110 for one. It will still have full function and be even stronger than stock!

SOURCE: stalling when starting

if after the two mins ur putting the choke back in and the bike dies, it could be that your needing to adjust the idle speed.
it might just be set on the lower limit so that when ur bike isnt fully warmed up it struggles.

SOURCE: Carb needs cleaning

Hey this link might help, lots of pictures in case its your first time. http://www.kawiforums.com/zzr600-zx-6r-old-school/104220-cleaning-carbs-your-old-school-6r-complete-writeup-w-pics.html

SOURCE: Keihin CVK-D36 carbs on a 20 yr old ZZR 600

It sounds like your bike has been sitting in storage for an extended period of time (a year or more) - and the carburetors are plugged up. If this is the case, they will need to be completely disassembled and cleaned out.
If it hasn't been sitting (and the carbs aren't plugged up) then check that all of the normal tune-up items have been performed, especially valve adjustment, oil and filters, spark plugs, etc. If this fails to produce positive results, perform a compression check on the engine. Each cylinder must be able to produce at least 140 psi of compression in order to run and idle properly.