So I took in a 03 YZ250f today at first the idle was so off that it would not run without revving the throttle, played with a combo of the air mixture screw and idle screw to get it to idle just fine. So now I notice tonight with one last test that the header and inside of the muffler were glowing red, and getting more red as I revved while I sat in neutral. I rode it around in 2nd and it was still glowing, just not as much. All this combined with the fact that my other concern is that when I get it revved up high (say top of third gear) then clutch and coast on it the engine kicks off and I have to kick her over again. Kicks over fine just after that but I'm wondering if all three of these issues are linked together?