If you have an old zama carb around that has the limiter caps on it, pull the caps. Then put one cap over one of the jets. Close the jet clockwise and count the turns while using a small screwdriver. Then remove the jet completely turning counterclockwise, and either notch it with a dremel or a hacksaw. Re-install and reset, then do the other jet the same way. You can also use a small brass tube or sometimes a straight Bic ink pen minus the guts. It will press over the jet and hold to the splines for adjustment or removal.
Best wishes,
Bob
PS. Searched the net for the styles used on the Zama carbs and found this:
AS OF RIGHT NOW THERE ARE 5 STYLES OF CARBURETOR JETS.
#1 IS CALLED A SPLINE, FOR THIS STYLE I USED TO USE A BALL POINT PEN WITH THE INSIDE REMOVED.
#2 IS CALLED SINDLE D, THE SCREW HAS A FLAT SPOT ON ONE SIDE
#3 IS CALLED A DOUBLE D, OF COURSE FLAT SPOT ON TWO SIDE
#4 IS CALLED A PAC MAN TOOL, THIS IS ALMOST COMPLETLY ROUND EXCEPT FOR A SMALL V NOTCH IN SCREW.
#5 IS A COMPLETE FLAT SCREW HEAD WITH A SMALL DIMPLE IN IT.
A COMPANY CALLED GARDNER CARRIES 4 OF THEM
www.GARDNERINC.COM
P/N FOR SPLINE TOOL IS 530 035 560
P/N FOR SINGLE D IS 308 535 001
P/N FOR DOUBLE D IS 308 535 002
P/N FOR PAC-MAN IS 308 535 003