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This paper details a multiyear effort at the University of Idaho to develop a very compact powertrain that results in a lower center of gravity and smaller pitch and yaw inertia for a single-seat open-wheeled hybrid competition vehicle. This design entails introducing torque from the electric motor to the countershaft of a Yamaha YZ250F engine, allowing torque multiplication via the transmission and thus to the final drive and wheels. Maximum motor speed into the countershaft corresponds to maximum speed of the engine. The repackaged powertrain features a D135RAG Lynch electric motor connected to a customized countershaft that is housed in a machined aluminum case that includes Original Equipment Manufacturer (OEM) engine and transmission internals. This case also incorporates a Torsen differential with an in-house designed planetary gear reduction.