Mounting bolt dimension:48mm/1.88″,the air filter interface outside diameter:35mm/1.37″,Intake inside diameter:19mm/0.74″The carburetor has a right-hand throttle valve for most 50cc 70CC 80cc 80cc 85cc 90cc 110cc ATV 4-stroke engine.Replacement all most sReplacement for 4 stroke 49cc-125cc horizontal engine,not for GY6 engine or vertical engine,hand choke carburetor not for cable choke or electric choke carb(read description for fitment infos)This kit does not replacement for all XR70/XR70R/CRF70/XR80/Z50 and early model than 2008 for CRF50 XR50Warranty:We are always available to help our customers.Please message us for replacement or refund if you are not satisfied with the orderpls confirm The size of the product meets your requirements before you purchaseNote:please allow 0.5-1 inch difference due to manual measurement.1inch=2.54cmSize:Mounting bolt dimension:48mm/1.88″Air filter interface outside diameter:35mm/1.37″Intake inside diameter:19mm/0.74″Replacement for:4 Stroke 49cc-125c