I have a 05 WR450. The bike has a FMF Power Bomb with Q2, and power now. The jetting is a JD jet kit with Boyseen Power Shot Accelerator Cover. I also use a Zip Ty Fuel Screw and Rekluse Auto Clutch. Here is the problem: If I'm on a serious up hill and have to slow down quickly for a turn, and then I chop the throttle from about 0 to 1/8th of a turn, the bike sometimes dies. This really became apparent when I put on the Power Shot which leads me to just removing it and putting on my old pump cover, but I was wondering if anyone else has had this problem. I can also make the bike die when idling by chopping the throttle quickly a couple of times in the garage in neutral. I contacted JD Jetting and they told me the WR450 doesn't need the Boysen pump cover, but I did notice the bike cleaned up very nicely after I put it on except for this 0 to 1/8th throttle problem. Any suggestions would be greatly appreciated.