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To fill this out a bit:
A reverse trike
Two CB750, or CB900 engines
Crankshafts connected 90 degrees out of phase,
RPMs always matched
8 separate firings every 2 revolutions.
Transmission outputs independently connected to opposite ends of differential
Transmissions shift-able independent of each other
Yoke of differential through shaft drive to rear wheel
10 useful up-shifts by shifting up one transmission at a time, then the other
Top 2 shifts employ putting one transmission in neutral, and braking that output
Engine in neutral turned off for top two gears
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