Hey fellas, I need a little help here. My '05 WR450 has a "sputtering"/"hesitation" problem at steady throttle. It's worse when it gets warmer. When I get on the throttle it picks up fine, it just does it at constant throttle position. It almost feels like a timing issue or mapping issue. I've done all the free mods, including removing the AIS and plugging it up properly (no leaks noted.) I installed a JD jetting kit , red needle 5th from top, 168 main, all other jets stock. (I live at 4,000' elev.) I just changed the plug (didn't look too bad but I changed it anyway.) There's no backfire upon decel nor when it "hesitates." BTW stock pipe with guts removed. It's not major, more annoying than anything. I probably wouldn't notice it too much riding dirt, but I dual sported it and I notice it on the commute (since gas is #$#%@$# expensive.) Any suggestions would be greatly appreciated. Thanks.