How normal is this? Start the bike up and within 3 minutes the head pipe is glowing red. From the head around the bend and right up to the power bomb area (FMF P-Bomb head pipe), also has a FMF power core4 w/quiet insert. Bike is 2003 WR450, grey wire cut..... etc jetting is a JD kit w/red fuel screw 48 pilot 168main I`m probally at about 500ft elevation and its about 55 degrees outside I just had the carb off to find out why last yr it ran soooo lean, thought I found a plugged up pilot and was all happy that my lean condition would be solved. Started the bike up and still acts the same as last yr . The bike has NO hesitation at all when reving it up but lots and lots of poping on decel!!!!!!!!!