Stock carburetor for your Tomos mopeds.
The PHVA uses 6mm Dellorto Jets. You can get those : here.
A little lesson on PHVA carbs. The first letter after the numbers: A means clamp on type mounting, B means rubber mounting, other letters were produced for specific applications and follow no rules The second letter is S for left, D for right as it refers to the side on the carb. where the mixture and throttle stop screws are.
For tuning tips, check out Garage. The worlds largest moped tuning database. Here are the list of the top Tomos builds in Garage using this carburetor. Use Garage as a guide to where you start and which jet you need.