In case you don't have it Pedro, here is the Zama Tech Guide:
http://www.zamacarb.com/pdfs/TechGuide_2007.pdfThe overhaul kit for the c1u m29d seems to be called RB-48 (all of the Zama overhaul kits have part numbers beginning with RB). It seems the kit does not include mixture needles, however:
http://www.sears.com/zama-carburetor-rebuild-overhaul-kit-zama-rb-48./p-SPM506253514PI suggest you send a Private Message to Bruce, the Outdoorking site owner. He will probably be able to tell you whether the mixture needles are available, and from whom.
