I noticed that my header pipe was glowing a lot brighter than I have seen before. I know on yfzs they tend to get pretty hot but this was crazy! Its a 2009 yfz450 Carb. When I went to go start it, it took me roughly 8 times to get it to stay running long enough for me to push it back to hop on and go... at first I was just thinking that since its Carb it just needs to warm up a bit. I took it out and just rode it fairly easy for about 5 mins pull it back in the garage and my header was glowing realllyyy bright red. Talked to a friend about it he said it could just possibly be running a little lean or needs re jetted... are there any other suggestions or ideas of what could be wrong.... help!!