1. Heat Range: Car spark plugs are designed for high-temperature environments and may not be suitable for the lower operating temperatures of lawnmowers. This can cause the spark plug to run too hot, leading to pre-ignition, knocking, and engine damage.
2. Thread Size and Reach: Car spark plugs may have different thread sizes and reach (the length of the threaded portion) compared to lawnmower spark plugs. Using a car spark plug with an incorrect thread size or reach can compromise the seal between the spark plug and the cylinder head, resulting in compression leaks, overheating, and potential damage to the engine.
3. Spark Gap: The spark gap (the distance between the center electrode and the ground electrode) of car spark plugs may not be appropriate for lawnmowers. An incorrect spark gap can affect the ignition timing and engine performance, leading to starting difficulties, misfiring, and poor fuel efficiency.
4. Resistance: Car spark plugs may have different resistor values compared to lawnmower spark plugs. The resistor helps to suppress electrical interference with electronic components in the engine. Using a car spark plug with an incorrect resistance value can interfere with the ignition system and cause various issues, including engine misfires and stalling.
5. Engine Compatibility: Car spark plugs are designed for specific engine types and performance requirements. Using a car spark plug in a lawnmower may result in improper combustion, inadequate performance, and potential damage to the engine.
Therefore, it is recommended to use the spark plug specified by the manufacturer for the lawnmower to ensure proper operation, reliability, and longevity of the engine. Please refer to the lawnmower's user manual or consult with a qualified repair technician for the correct spark plug selection.
