18MM CARBURETOR FOR UPGRADED (NON-STOCK) HONDA CRF50 XR50 CRF XR 50 CARB CA02 15mm Stock Replacement Honda 50 Carburetor The intake side center to center bolt holes are 49mm apart. The air filter side is of the carburetor opening is 32mm. Fits All Models and Years Honda 50cc Pit Bikes ( XR50, CRF50, Z50 ) 90 day Warranty on this item.