THIS IS A MIKUNI CARBURETOR FOR A POLARIS TRIPLE SNOWMOBILE. Came off of a 1985-87 indy 600 IT IS 38mm I.D. AND 43mm O.D. ON THE ENGINE SIDE, AND 62mm O.D. ON THE AIR BOX SIDE. They will need to be cleaned/rebuilt. The sled ran 2 year ago. Hard to find