Model names: GX390, GX420, 188F Mounting and size Distance between two assembly holes: 53 mm Inner diameter: 22 mm Product purpose and quality Quality aftermarket carburetor parts Engineered as a reliable alternative to original carburetors for GX390, GX420, and 188F engines Performance and reliability Easy to install and reliable to use Professional installation recommended to ensure proper fit and function Benefits and compatibility Provides a costeffective replacement to restore or maintain engine performance on compatible GXseries and 188F engines Standard mounting configuration with 53 mm hole spacing and 22 mm bore supports straightforward replacement Key attributes Function: Carburetor replacement for specified engines Compatibility: GX390, GX420, 188F engines Size: Mount hole spacing 53 mm; bore diameter 22 mm Material: Quality aftermarket parts (no additional materials specified) Performance: Reliable operation when installed correctly Use scenarios Scenario 1: a worn carburetor on a residential or portable generator powered by GX390 or GX420 engine to restore starting and running reliability Scenario 2: the carburetor on a lawn tractor, mower, or tiller using GX390 or GX420 engine to improve idle stability and fuel delivery Scenario 3: Use as a replacement carburetor for equipment such as pressure washers or water pumps that use 188F engines, improving overall performance and reliability Installation note Easy to install and reliable to use, professional installation is recommended to ensure proper mounting and tuning