Went i star the bike i open the choke to warm the bike after a few sec close the shock the bike die runs only with the choke open what can be

pull out the plug clean it off and while out crank it a few times do not give it any throttle action at all and whey you put it back in ,, in a few min close the choke and hit the throttle 1 time and it should start , start opening choke as it warms up

Only running good with the choke on is an indicator that the bike is normally running too lean. The fact that it runs good with the choke on at least tells me it is getting fuel to the carb(s). Therefore it seems probable that there is clogging in the carburetor jets or there is a big air leak between the engine and carb(s).

rate my post for perfect solution
Instructions

1. • 1 Open the choke by pulling the choke lever on the left handlebar control toward you. Set the bike on its kickstand, put it in "Neutral" and start it up. Allow the Road Star to warm up for about 10 minutes before continuing with the adjustment procedure.
     
   • 2 Locate the idle adjustment screw on left side of the bike just below the rider's seat. Twist the adjuster screw clockwise one full turn. This will ensure the bike stays alive so you can adjust it to the proper setting.
     
   • 3 Close the choke lever and listen to the engine carefully. Twist the idle adjustment screw slowly counterclockwise. You should hear the engine speed start to slow.
     
   • 4 Twist the idle screw counterclockwise until you hear the engine start to sputter and die. When this happens, stop and turn the screw one half turn clockwise. Your bike should now be idling at the correct speed.
     

If your bike will only run with the choke pulled then you need to go in the carbs and clean them out.Sounds like you simply have some stopped up needle jets or main jets so the bike isnt getting the right mixture of fuel and air to run on after it warms up.I just built an 81 CM400 for a girl and hers wouldnt even run with the choke on or off lol. The best and cheapest place to find parts is EBAY to be honest.There are tons of aftermarket bike parts sales on the internet ie: Bike Bandit,KZ parts and the like. I lowered hers by getting a shorter throw shock but you need to check your clearance under the fender so she doesnt bottom out from too short a shock. Good luck.

Sounds like the idle circuit in the carb is restricted. The engine is running on the choke only. When the engine reaches a certain temp the fuelthat does get is more readily burned allowing you to back off the choke. The choke probsbly can't be completely opened? right? Fuel quality is also something to consider Oil content in fuel affects combustion temps and volatility. _good luck_Ned_

sounds like it needs the carbs cleaning...* maybe some new spark plugs

If the bike has sat for a long period of time without being run - the gas that is sitting in the carb(s) will shellac.. Then the carb(s) would need to be cleaned and "rebuilt"..

The choke is closed (pushed away from you) to start the bike. When it has warmed up the lever can be pulled back toward you opening the choke back up.

sounds like the gas went bad and stoped up a carburator clean them up and blow jets out with high pressure air this should help good luck