Abstract: An elongated ignition boot for a spark plug having an insulator section and a terminal, the spark plug being located in a spark plug receiving cavity of a cylinder. The ignition boot has a spark plug receiving aperture, a lead receiving aperture to receive an ignition lead and connector terminal, a channelway passing from the spark plug receiving aperture to the ignition lead receiving aperture, and a sealing portion located peripherally at or adjacent the spark plug receiving aperture and urgable against the wall of the spark plug receiving cavity.