2009 kx450 decel backfiring

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May 22, 2020
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#1
I have a 2009 kx450f and I'm clueless! This bike is fuel injected and it is backfiring on decel only. I replaced the fuel pump checked for air leaks and fixed any exhaust leaks i found and nothing worked. I just bought the bike, the only mod is a Full Fmf Factory 4.1 with the Mega bomb. Has anyone experienced this problem with fuel injection? It runs great outside of the loud gunshot like backfires on decel:(