2000 YZ426F HELP!!!! < SnakesRus > 04/11 17:43:15 My bike is impossible to start..... I just put a new plug in it and adjusted my carb back to stock specs besides the idle screw, cause i need the bike running to get that right. Ive heard it might need a valve job. Ive also heard that it might need to be rejetted due to my FMF Powercore 4 exhaust. It has great compression, its impossible to kick over at the top of the stroke and I know it gets spark because Ive got it started once and rode it around for a while. When I did ride it I noticed it popped when decelerating, it ran hot enough to start overheating (coolant was coming out of the over flow) and to start melting my side panel at idle (however it didnt have a heat shield like it is supposed to). Any ideas..