New 04 wr450 throttle response

This bike is stock except for the plug out of the muffler. At 0 to 1/8 throttle there is a pause and then it comes on. It does not have a air/fuel screw so are there any suggestions. We are at sea level if this helps. Any ideas. Thanks

Put in a 48 pilot and an adjustable zip ty fuel screw. :cry:

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