Lawn Mower Spark Plug BPR4ES

This NGK BPR4ES spark plug is sourced from the original manufacturer for use in a variety of small engines. It is responsible for igniting the fuel-air mixture in the engine cylinder, needed for the engine to operate. The spark plug is a small, cylindrical part consisting of a metal body, a ceramic/porcelain insulator, one center electrode, and one ground electrode. The spark plug can fail if the insulator breaks, the electrodes wear down, or if it becomes fouled. If the spark plug has failed, you will experience difficulties starting your equipment, decreased power output, and engine misfiring. To check if the spark plug is faulty, you can use a spark tester or a multimeter set to continuity. To replace the spark plug, first disconnect the spark plug wire, and then use a spark plug socket wrench to loosen and remove the old spark plug. Take the new spark plug and set the gap to the correct size. Thread it into the cylinder head using your hands to avoid cross-threading. Once it is in place you can finish tightening it with the spark plug socket wrench. Reconnect the wire, and the equipment should be ready to run smoothly again.