A magnet is attached to the engine’s crankshaft to time the voltage spikes, these spikes are fed directly into the spark plugs to cause ignition, this is why you don’t need a battery.

That means real four-cycle operation with spark ignition and fully-functional valve trains, oil pumps, water pumps and fuel pumps. These beautiful 1/4-scale engines are the creation of aptly-named ...

A spark plug is a simple device that turns the ignition system’s energy into spark, which ignites the fuel mixture. The short version of how they work is by sending electricity through the plug ...