Wont start or run without full choke
Sounds like the bike is struggling with being too lean.
The choke richens the mixture by increasing the fuel to air ratio
Often these old carbs get worn out and allow air in without going via the air box.
However I would look over the bike and ensure all cables and things are working properly. Ensure all gaskets, gromets and surfaces are seated properly.
Lastly cleaning the carb jets will ensure there are no blockages restricting fuel flow
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: wont run /idle
i'd start with removing the carbs and giving them a thorough cleaning as when bikes sit for so long, the carbs begin to get gummy/varnished from the old gas.
check for blocked holes in the pilot jet & main jet and look for "hard & dried up" gas in passages. be careful of the float bowl gasket as to not tear it or you will need a replacement.
SOURCE: I have a 1985 Kawasaki Bayou 4 wheeler, I had took
ok buddy your not getting enough fuel in the carb so on the carb will be a screw you need to turn this mixture screw out a turn and try it if this doesnt work get back to me buddy
SOURCE: 2007 klx 250 runs only when choke is on.
hi buddy on carb is a mixture air screw fiddle with this till it runs if it doesnt i have another plan buddy get back to me with results 
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