What if you leave the "meter" connected via the "led panel wires", and switched on, without the blue and green pins inserted? I think the blue and green are involved in speed setting. Not sure which of blue and green are involved with "6Kph" walking mode, and which is 3 speed determination. Although blue is "power key" according to the diagram, so I could be wrong. The fact your speed is truncated to 12kph seems that it is related to the "meter" setting, assuming you don't have the white/white "speed limiter" going on as well. On our Ku65, the three speed buttons didn't seem to do anything noticeable to vary the top speed. I'll fiddle with it a bit tonight. It wouldn't be easy to try my suggestion though without taking the connector apart to the meter. And just soldering it up thereafter, after you tried the permutations. You might probe the connector pins just to see if there are only low voltages on that connector, or not. (on the controller side). If there is full pack voltage on the red, I'd be more careful.
Last edited by chvid; 04-16-13 at 03:07 PM.