That's the Panasonic system, the same as what KTM use. Bad luck. There is a way to do it, but the secret has never been published. I've never had one, so no chance to figure it out.. If you're any good at electronics and wiring, you can make a frequency divider for the motor speed signal. You'd have to hack in to the motor cable to get at the signal wire, or open up the battery case to find where it joins to the controller. there's a thread on making a frequency divider, but I don't think the schematic is complete:
http://www.pedelecs.co.uk/forum/threads/ebike-derestrictor.25266/