Brammo's Empulse R is way more complex than Zero's. The six gear xmission and water cooled motor are but two additional elements that are no doubt giving Brammo headaches from a reliability and manufacturability perspective. But Brammo hasn't even shipped the more simple Zero S SF9 equivalent, the Inertia+, have they?
Not yet to consumers, though Brammo has reportedly been supplying the Enertia Plus to the Hong Kong Police Department since June-ish.
By capacity, the Enertia Plus sits between the ZF6 and ZF9 bikes (6.2 kWh, 5.6 kWh, 7.9 kWh respectively).
I don't know how involved Brammo was in the design of the SMRE motor/transmission combination - I suspect SMRE is 99% responsible for designing the motor for reliability and manufacturing.
The delay in the (comparably) simpler Enertia Plus points to the batteries or the sevcon controllers as the reason for the lengthy Empulse delay, NOT necessarily the motor and transmission.
Speaking of controllers.. it will be interesting to see if Brammo has used the extra development time to improve the reliability of the sevcon controllers, or if we'll eventually see reports of glitches and cutouts appear in the brammo forums. It would be somewhat ironic
if they do iron out those issues by shipping much later than Zero, and reliability concerns for the transmission and liquid cooled motor prove to be unfounded.