New to Odysseys and to this site....Very cool forum! My son just traded his Zooma Ty Rod 2 Kart for an FL250 Odyssey that needs engine work. Just beginning to dig into it, but right off the bat I'm not understanding the reason for the "Sealing Bolt" hole next to the spark plug hole..?? And why would they make it the exact same size and threads as the spark plug hole if it wasn't meant for another spark plug? The motor has compression but I haven't tested it yet. It has the system with points and the wires from the magneto are not connected to the coil, so testing for spark is my first challenge. Thanx in advance for any help. We live near beaches with dunes so we can't wait to get it going!