If you remove the battery Tranki, then turn the bike upside down and look just behind the bottom bracket you'll see some wiring harnesses under the battery area.
On one of the bundled cables there is a single ended short stub sticking out. If you remove the insulation from that, you'll find a connector on the end. If you unplug that, the limiter is off. It's best to use some insulating tape afterwards to protect the ends against damp.
The stub is usually tucked under the other cables so you'll need to unearth them a bit, and you might have to cut a tie-wrap to do that.
Sorry no photo, but as it's usually buried under the other cables, it's not easily demonstrated pictorially.
I've now added fully illustrated details on doing this in my website
here.
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