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The reversing gear is usually just an electric motor either with a separate clutch or with a lever that engages the sprocket into the chain (moves the whole motor/sprocket up and down).
They use that setup on trike conversions often.
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"¿ʞɐǝɹɟ ɐ ǝɹ,noʎ uǝɥʍ 'ʇı ʇ,usı 'ʎlǝuol s,ʇı"
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