I have done all free mods on my 07 WR450, AIS removed, Dr. D Full Race Exhaust, JD Jetting (170, 48 and Red Needle at 4th clip, I think) for sea level, 80-90 degree temp. The jetting (i think) is pretty much spot on but I sometimes notice a bog when i whack the throttle hard in 4th gear (at the lower end). This happens just before a wheelie... on a rare occasion when i think i am in 3rd but i am actually in 4th. I recently purchased and installed the R & D Power Pump with the stiffer spring and set the ALJ at #40. Throttle response is definitely crisper but the 4th gear bog is sill there. I have adjusted ALJ to #30 and #50 and it's still there. Can i get rid of this bog? What should i do / change / adjust? Thanks.