What ignition system is primarily used in most small gas engines?

The primary ignition system used in most small gas engines is the magneto. This type of ignition system is self-contained and does not require a battery to operate, which is advantageous for smaller engines often found in lawn equipment, chainsaws, and similar devices. Magnetos generate high-voltage electricity using a rotating magnet and coil assembly, providing a reliable spark at the right moment for combustion.

This design is particularly suited for small engines because it enables them to operate independently of electrical systems that might be necessary for larger engines, simplifying the mechanical layout while reducing weight and increasing reliability in various weather conditions. The magneto system can efficiently provide a strong spark even at lower speeds, which is essential in ensuring that small engines start easily and run smoothly.

Other ignition systems, such as the distributor, electronic, and coil-on-plug, are more commonly found in larger automotive engines where more sophisticated control over ignition timing and fuel efficiency is needed. These systems typically require additional components like batteries or complex wiring, which are not practical for the design and operation of small gas engines.