Here is some info and a pic from Mike Acres site: http://64.180.101.188/cscc.nsf/ed1d...d81aba4e4fb4aac188256c2f001ca16c?OpenDocument
The Zama carb initial adjustment for the low and high speed mixture needles is 1 turn open from a lightly seated position.
Make final carb adjustments with engine warm and running. Be sure air filter is clean before making the final adjustments. Adjust the idle screw so the engine idles just below clutch engagement speed.