Champion Spark Plug (RDJ7Y). The spark plug ignites the fuel and air mixture in the engine's cylinder to power the engine. If the spark plug is has fouled (if the tip of the spark plug is burnt or damaged), the engine may not start or may run rough.
Yard Machines String Trimmer Model 3100M Parts are easily labeled on this page to help you find the correct component for your repair. Filter results by category, title and symptom. You can also view diagrams and manuals, review common problems that may help answer your questions, watch related videos, read insightful articles or use our repair help guide to get started. For additional assistance, please contact our customer service number at 1-800-269-2609, 24-hours a day, seven-days a week or send us a message in the live chat box at the top left or bottom right corners of the page.