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2004 yz 450f Jet?

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i just bought a 2004 yz 450f the bike is completely stock except for a fmf powercore exhaust with a powebomb header. and a K & N air filter. i have never jetted a bike before and wondering if anyone has any suggestions for me? do i run stock jets with that set up or change it up? it backfires when decelerated too fast. any help would be greatly appreciated....thanks

cory

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If the only running issue is decel backfire, it is probably fine.

You have a race bike. No one who races coasts, so popping should not be a problem. You also have an open pipe which makes decel popping worse.

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so i should be fine leaving the jetting the way it is for best results? yeah the only problem i am having is the decel popping.

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