hes bored,,an old thread but the brass main jets can be wrong,ive checked a few and the stock kiehin #100 will just gently pass a 1 mm drill bit,,on the keyster #100 the same drill bit floats through much easier=rich, at least on my batch,use the factory jet needles unless they have an obvious worn flat on the taper,,use a magnifying glass,it might be too late,april24/2010 was obnoxs last post.