still not idling right

i took my carb apart and cleaned pilot jet and all other jets and adjusted fuel screw and idle and it still wont idle right... it idles for about 20 secs maybe then dies out. wat is the next step to making my 98' yz400f idle right?

I assume at one time it did idle right. Sometimes, cleaning a pilot just does not work and it must be replaced.

not really i got it and it didnt idle at all with the choke off but the owner told me it did idle before it sat. i took apart carb twice now and cleaned and tuned now its way better but still not constant idle... how can i fix?

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