Please help 05 yz450

Hey guys please help me out. My bike starts when it's cold but it back fires a lot. It also stalls out after riding if I come to a complete stop. It also runs like crap if the choke isn't on. The shop told me the carb has a crack but they sealed it with jv weld. Any help would be greatly appreciated. Thanks

Well the crack is kind of suspect, but if you're sure that's not it, I would say you have a vacuum leak or a clogged/dirty pilot jet. 

Well the crack is kind of suspect, but if you're sure that's not it, I would say you have a vacuum leak or a clogged/dirty pilot jet.

Thanks for the reply. How could I check for a leak or unclog the jet and put it back the right way

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