I bet a single clutch would work. Plenty of those motors were drag raced , I'm sure you could find heavy duty springs and better than stock clutch plates. My idea of the lovejoy coupler attaches both cranks with rubber isolation of the coupler. Problem would be crank adapters strong enough to handle to torque from the isolated engine. I would love to build or buy a reverse trike, good luck with the build. With a jack shaft setup you could put one engine in neutral at cruising speeds for better economy.
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