Flying Horse 2-Stroke Motorized Bicycle Engine Magneto Loop Set &ndash; Gas Bike Sparker Wire Loop Set The Magneto Loop Set helps provide spark to the spark plug of most 2-stroke 48cc and 66/80cc bicycle engine kits Installation is a breeze: remove your magneto case cover, unbolt the existing magneto loop set from the case, and remove from the engine. Line the eye of the black wire with one of the screw ports and bolt the magneto back in to the case. Reinstall the case cover and wire per your engine's wiring diagram (you may need to look at your installation guide)- now you're ready to ride