After many weeks of trying to dial the bog outta the '99 YZ400, it's finally GONE!!!! I can't believe how this bike runs now, it's like my old RM250. I wick the throttle open instantly and the bike just lights off the line, no hesitation at all. BIG THANKS must go out to Yamakaze, Taffy, JD, and all the others, but especially Yamakaze, whom contributed to the solution! TT Rules. The only minor hesitation I have now is when I wick the throttle going slow in 3rd or 4th gear, but it's a small hesitation. I'm going to install the Starting Line Products Power Pak dealio tommorrow and see how that works. '99 YZ400, WR426 Flywheel & Stator 160MAJ/155MJ, OBEKN-3, 40PJ/75PAS, FS 2 turns out.