poping on decel

I got a 08 yz450f with a fmf pipe and rebuilt motor. when i totaly let off the throttle it pops nonstop on decel. could this be a jettin issue or exaust issue i dont know any help appreciated

Lean jetting or air leak in exhaust?

i have a stock 08 yz450f and i ride about 340 ft above sea level and it still pops on decel. is this normal??

Read the links in the second post.

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