Most small engines use which type of system to supply ignition spark?

Most small engines utilize a magneto system for ignition spark due to its efficiency and design simplicity. A magneto ignition system generates its own electrical power to create the spark needed for combustion. This is particularly advantageous in small engine applications, such as those found in lawn mowers, chainsaws, and other handheld equipment, where the engine size, weight, and operational reliability are crucial.

The magneto system works by using a rotating magnet within a coil to produce voltage, which then causes a spark at the spark plug. This self-sufficient design eliminates the need for a separate battery, making it more practical for devices where a continuous power supply isn't feasible. The ability to generate ignition without relying on external power sources ensures that small engines can reliably start and operate efficiently.

In contrast, battery ignition systems require an external battery to provide the voltage needed for the spark. Solid-state ignition and capacitor discharge ignition, while also effective, are not as commonly found in typical small engines as they are in larger engines or certain specialized applications. Thus, the magneto system stands out as the most widely adopted solution for providing ignition spark in small engine technology.