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1996 dr 350 with a big gun header and muffler runs great until you open it up, it cuts out and pops like its running out of gas,then if you back out of it its fine until you get back into it again and the same thing happens. Some help please. 

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Is the spark plug's tip showing a lean condition?

if yes, a too lean main jet and/or, too low fuel level in the carburetor.

 

If the plug is showing a rich condition, then perhaps ignition related.

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