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This paper describes the potential motorcycle application of a parallel hybrid powertrain that was conceptualized, designed, developed and tested (for passenger car application) at Southwest Research Institute (SwRI). The patented powertrain mechanical layout and controller are described in this paper. The transitioning between operating modes has been analyzed for satisfactory performance. Initial fuel consumption simulations of the parallel hybrid drivetrain indicate more than double the fuel economy of an equivalent-size conventional drivetrain. The model has been previously validated on a passenger vehicle-sized prototype. The Southwest Research Institute inventors have been recently awarded U.S. Patent 6,110,066 for the parallel hybrid drivetrain.