I like to keep all my jets in paper bag and then have a friend pick one out(with eyes closed of course). But seriously folks... here's some good reading from RRW on the subject of jetting a 125. http://www.roadracingworld.com/issues/june97/rs125.html http://www.roadracingworld.com/issues/oct97/oct4.htm
WITH A JET TOOL, YOU IDIOT!!!!! HAAAA, HA, HA, HA, HA (I just kill myself, sometimes). Actually, I find a rat tail file works pretty well. If I can't find that, I might resort to the die grinder or the cutting torch. I figure I need to be a little rich to keep from sticking it. Jack