Unproperly called -PZ30- this carburetor is perfect for 140 to 150cc
 
Section oblong 22.2 x 28.5mm = 26mm true venturi area
Fixing by 2 screws 6 mm in the axle.
Connecting to air box 42mm
Main jet 100
Slow jet 20
Fixing eye to eye for the intake pipe 48mm
A real gain compared to conventional carburetor which are often 22mm venturi section only