Sorry guys, I search every where and I couldn't seem to find what I was looking for. Maybe you guys can help me out. Any help would be much appreciated. I just bought a new 2008 WR450, this is what I have done. Throttle stop removed Grey wire cut Opened airbox AIS has NOT been removed TPS still connected Stock pipe with peashooter removed JD jetting kit Main 168 - I have gone one up and one down and it stutters. 168 is the best. Pilot 45 - I went one up to 48 and didn't like it. So I went back down to 45 Red needle with clip in 4th position Fuel Screw 1.5 turns out R&D Power Pump with leak jet set to 40 PowerNow & PowerPlus My Problem: Off the low end it pulls great, between 0 and 1/2 throttle I have plenty of power, it pulls strong. Between 1/2 and Full throttle it just stops pulling, it's like the powerband just quits at half throttle position and doesn't want to go any higher. It doesn't really bog, it does seem to stutter a little bit, but not much at all. However, more than anything it just stops pulling as soon as I get to 1/2 throttle. Almost as if it is choked up. My old WR 2003 pulled strong all the way through the gear. Any ideas fellas?