Hey everybody I'm new here and I need some advise. I have a 2004 yz450f that had a lot of popping on deceleration. I am pretty mechanical inclined I work on bikes all the time but I can't get this one figured out. I first started cleaning carb and checking valves. Everything is good now I have a 150 pilot jet and a 170 main jet. Fuel screw is at 2.5 turns out. I just put a new exhaust gasket in it. I don't know what else it could be I am riding at 0-500 ft elevation, it is about 50 here Any advise will be greatly appreciated.