Performance 20mm Carburetor for 88cc Big Bore Honda 50 Pit Bikes [4208] 20mm Performance Carburetor Fits Honda CRF XR Z 50 and 70 Pit Bikes Designed for Increased Airflow for 88cc-up Big Bore Modified Engines Intake throat diameter: 20mm -Bolt hole spacing: 48mm - Air filter mount diameter: 32mm Brand new - 50 Caliber Racing - Free shipping to USA