John Deere M71939 Spark Plug is a John Deere equipment manufacturer (OEM) part designed to ensure optimal performance and reliability. This spark plug fits a variety of John Deere models including the 345 (except for engines marked FD611V-ES01445 except with engine marked ES01 or FS01), F725 (except for engines marked FS590-ES03), and F735LX178, LX188. Crafted to meet the high standards of John Deere machinery, it provides dependable ignition and helps maintain the efficiency of your equipment. For assistance in finding the right John Deere part or accessory, John Deere specialists are available Monday through Friday from 8:00 AM to 5:00 PM (EST) by calling 800-345-2396 or via email. Hartville Hardware strives to recommend accurate parts based on reliable systems, but since parts and compatibility can change without notice, contacting customer support for confirmation is advised. Model Number: M71939