help stalling

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Tuesday my brother installed an HMF on my Raptor 350. We had it running good but decided we needed to install slightly bigger pilots. We put it back to stock for now. I started it today and it does not want to stay running. Runs for like a minute and stalls. With the choke full it idles steady for a while and the rpm's get higher and higher until I back off the choke and it stalls and will not start again. I was thinging it might be the mixture screw since we only turned it out two turns and it should be a half more. Yesterday I started it and it ran fine when it was warmed up. Can anyone help?
 
Ok, we adjusted the mixture screw to 3 turns out. Choke kills the engine when it's running. I am going to try it again tomorrow morning, when it's cold, and see if it's any better.
 
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