This 30mm carburetor with manual choke lever is most commonly used for (but not limited to) 125cc 150cc, 200cc and 250cc ATVs and dirt bikes. Also very commonly used for many models of golf carts and other models of Go karts / buggies and some scooters.
Manifold Inner Diameter: 29.5mm
Breather Inner Diameter: 39mm
Breather Outer Diameter: 43.6mm
Bolt Mount (centre to centre): 48mm