rdmex
05-22-2002, 02:57 PM
i have a 2000 400ex and i need help on jetting, i have a fmf pipe, a 142 jet in it now, and a kn air filter. the 142 came with the kn jet it and i stepped it up to a stock-148 and it didnt help so i stepped it up to a 165 and it was just too much for it. With the 142 in ir right now it is smoking like crazy and i dont know why. The plugs have build-up on them and it dont run right and if u let it idle then try to punch it, it will kill and i have to start it and clear all the black smoke out. PLEASE HELP i am thinkin maybe new accelerator pump or head gasket or ***** i dunno. please help