Hey guys, I bought the yz450f at the beginning of last year and have had this bottom end problem since I bought it. The previous owner put in hot cams and changed the jetting Stock jetting is 45/162 and he changed it to 48/168 When I first got the bike the problem was really bad but I fixed it a lot by moving the clip of the needle to the very top, moving the needle all the way down. Next I tore the bike apart and cleaned everything from the carb and changed the main jet to 165 The bike was actually running good for 1 day, but the next day the problem returned After that I took the carb apart again and put in a 42 pilot jet Bike still has the bottom end bog and now it backfires on deceleration. I really need help with this. The mid and top end power of this bike is amazing I just need to fix the speed out of the corners. It's really annoying. Thanks in advance for any advice!