I also can't adjust the carburetor due to the EPA restrictions without the proper tool.
..where are you, and could you post a pic of this carburetor??
..i'm very curious, as i've never heard of such a thing...
All new carburetors sold in the U.S. for 50cc or below engines must follow the EPA federal laws that recently took place. So, any new moped you buy made after the new laws took affect, basically now, will have flat screw heads for the float chamber and a plug over the mixture screw, which may or may not have a phillips screw head. Another friend of mine bought a moped a bit after mine and his carburetor was completely locked down. We had to take a power drill to the screws just to put a new jet in. This is done because they want only the dealers adjusting the carburetor to avoid breaking the EPA federal emission laws. For the new Kymco's, I believe 2012 and on, you will need a special D-shape screwdriver to adjust the mixture screw, like mine. It's illegal to sell to the general public, as only dealers should have it, and carries I believe a $36,000 fine for violating the emission laws. You can sill find them online easily though.