2004 yz450f poppin on decel

Hey folks just installed abR&D powerbowl for my carb, air/fuel screw is 2 1/2 turns out the jetting is a happy medium tune from stock specs also shorten my exhaust 4.5 inches not sure if the header pipe is tightly snug to the remainder of the exhaust. An should I change to a hotter spark plug? Thanks.

Adjust your fuel screw properly following the 'how to determine you pilot setting' at the top of the forum.

Shortening your pipe will reduce the power.

Replace you crush washer

No need to change plug heat range; it has nothing to do with your jetting

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