An engine-powered air pump designed to inflate tires using the engine’s cylinder as an air compressor. This premise is vaguely alarming but actually quite well thought out. A pump unit threads into one of the engines spark plug holes, and as the engine runs/spins, fresh, clean air is pumped to the tires. Inflating a motorcycle tire takes less than one minute and is completely safe for your engine and ignition system. The cylinder pump pulls air from the atmosphere, ensuring no gas or oil fumes turn your Metzeler’s into a Hindenburg wannabe. RiderWearHouse exclusive kit includes a 60” quick-release air hose and 18, 14, 12, and 10 mm adapters for all spark plug openings. (Other versions of this product are bulkier and contain extra components. This is just the essentials.) Works with all multi-cylinder engines. 12.5 oz.