Hello all, I currently live in Phoenix Arizona and I am having problems with my 2006 KX450F backfire. Its rides perfectly fine and has all the power in the world, does not lack on the responsive side at all. But whenever I engine break I pop A LOT. "Poppopopopopopopopopop" and its whenever I am slowing down after either going fast or slow. I want to know how to stop that, I understand that some popping is okay, but its a lot, spits fire sometimes after going fast. I am not sure what current jets I have in the bike, because the previous owner did not know, but I am thinking of going to a 180 main jet, 42 pilot, 55 leak jet (from 70 stock), throttle clip position 4th from the top, and 2 turns out on the fuel screw. I have heard a lot of people changing the leak jet from 70 to 55 helps a lot overall. I am not sure on what to use for the elevation wise on the jets. I have tried to lean and richen the fuel screw before but nothing has happened. Any suggestions of what I should do? Just thinking of getting JD Jetting kit and going from there.