@ Nick and Life,
possibly an interesting report:
TuneECU - Discussion, Q and A - Page 18 - Triumph Forum: Triumph Rat Motorcycle Forums Post #172
and here the solution:
TuneECU - Discussion, Q and A - Page 18 - Triumph Forum: Triumph Rat Motorcycle Forums Post #174
Could be that this approach works with the Keihin ECU.
BR, Tom