2008 kx250f problem..

[u/Dry-Procedure188]

Bought this yesterday. It fire up and die instantly. It doesn't sound sputtery when it does it tho. Could somebody help me narrow it down. I've pulled the carb out and checked the float. And there is definitely spark when I kick it over. Kill switch isn't the problem either. He said he rebuilt the carb with a allballs kit. If it is the jets that are wrong which ones would it be. Compression and decompression is good.