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Wow never heard of a firetube! Sounds ingenious. No, this had a set of spring loaded contact points that were mechanically closed by a linkage arm from the gearing off the crank. The points were inside the combustion chamber. It had a centrifugal governor that would expand when the rpm was correct, cancelling the spark till it retracted, then the next POP. The firing was intermittent, POP---PO PO POP-POPI don't think this is the exact model but close.