This intake manifold is designed to work with 26mm to 27mm carburetors in 4-stroke machines. It will fit many 125cc to 200cc engines in ATVs, Dirt Bikes, and Scooters. Commonly used in conjunction with PZ26 & PZ27 carbs. Opening is 30.1mm, the Mounting holes are 6.2cm apart and the bolt studs are 4.8cm apart center to center.