I haven't actually seen it but read about it. I think I guy just cut of a spark plug and made a hose arrangement with a chuck on it. Remove a plug and connect the hose. If a multi cylinder engine I believe you can crank the engine (probably fuel off) and pump up the tire in the field. I'd suppose you could do the same on a single even with just a kicker and strong leg. Some air better must be than none when flat.
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