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I have a 2007 YZ250F. It seems as though it runs better with the choke out. I've checked for air leaks and apparently none. Any ideas why this is happening?

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14 hours ago, mlatour said:

Check for a blocked slow jet / passageway.

this ^^^ otherwise known as the pilot or idle jet ....  

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I just rebuilt the carb with stock jets. Someone mentioned that I need to have the needle jet at the 3rd level. Also, the stock main jet should be different than what the stock one is.

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Also, someone had mentioned to me that the valves may need adjusted. I just purchased this bike. It was a steal. But, I have to figure out the rough running. 

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