This 27mm carburetor with manual choke lever is most commonly used for (but not limited to) 125cc 150cc, 200cc and 250cc ATVs and dirt bikes. Commonly called "PZ27". Also very commonly used for many models of golf carts and other models of Go karts / buggies and some scooters.
Manifold Inner Diameter: 26.4mm
Breather Inner Diameter: 35.2mm
Breather Outer Diameter: 39mm
Bolt Mount (centre to centre): 48mm