Think I found a valuable lesson yesterday trying to get rid of a rich problem on the top end. Some ideas about carb mods may work for them, but nine emulsion holes are at least one too many inn a walbro. Went from three and half turns out with main jet to 1 1/4 ish and pulls great to 5500. That is once I got past the huge dead spot off idle. Well, a little lead and time took care of a way too big air bleed, too many holes, and a little more time, a dremel, drill set and jb weld takes care of the dead spot. Yea have the walbro running great now, but have a 7 series Tec, bowl kit (w/blue emulsion) and another emulsion tube plus brown jet ordered. From what I've researched, it makes sense why the Tec carb is better. KISS!