250x starting issue
 

Hi my name is chris. I am new to this site and really have no idea what i am doing. Anyways on to my question. I have a 1987 250x motor that I put into my 1991 250x frame after wrecking my '87. Due to my parents divorce it has been sitting a while. I have finally got it back into my possesion and started to work on it agian. The motor ran perfect before removing it from the wrecked '87. I have put everything in its correct place using my brothers as kind of a example to go off of. I have cleaned the carb and put fresh fuel in it and cleaned the petcock on the tank. Now heres my problem I can place my hand over the back of the carb and it will fire but then idle high and die out it is completly stock as far as i know. I have tried everything i can think of is there something i am missing? I have also tried pull starting it and it will fire but also die out right away. I am at a loss. I am starting to regert getting rid of my 250r and 450r. I am a high school student with a full time job and have limited time to work on it but i like to do my own work. Any help would be greatly apprciated.

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it sounds like a carb issue iv had the same thing happen before take your iddle and main jet out and look through them up in the light they should be completly clear of all debre and look shinny on the inside you can use torch needles to check and make sure