Hey guys I got a buddy that has a 04 wr450 that has always ran perfect the 9 yrs he owned it. Not a single bog or carb issues ever, previous owner had it tuned perfect. He had it apart and cleaned it this winter and put it back together and it idles, but not well, pops badly on decel and glows the header red hot. The guy knows what he's doin and didn't touch a single jet, replaced the diaphragm in the acc pump because it was coming apart. But other than that, didn't do a thing but clean it. The only obvious problem is that the choke won't stay on and it seems to run better when the choke is held on now, which leads us to believe its lean and needs more fuel. But it has a 45 pilot jet and is turned out 3 turns. If it does need a bigger pilot, I don't understand what could cause it to need one since it's never needed one and he just really shouldn't need anything bigger than a 45 for this bike. Any input or experience with this odd issue would be appreciated since we are trying to resolve this issue quickly to go on our annual trip to Missouri in a few weeks, thanks!