help please

[450Rrider13]

im runnin a full system fatboy 4 and it gives a lot of backrap and 2 much pop when i let of the gas...is this a jettin problem...any1 with a fat boy 4 what u runnin for the main jet? thanks in advance

Your pilot circuit is lean. Try turning out the air/fuel screw. You might need a bigger pilot jet.