New spark plugs are an essential part of keeping your outdoor power equipment's engine running at its peak performance and efficiency levels. Worn or fouled spark plugs result in frequent misfires, increased exhaust emissions, wasted gas and reduced power. New spark plugs can make pull starting your lawn mower, string trimmer or snow blower significantly easier. Use our Parts Diagram Tool to look up the spark plug for your Troy-Bilt or our Part Finder to make sure you're getting the right spark plugs for your machine.