When you switch to high beams is there no light at all, or do they just not switch to high? The high and low beams in the Xenon Rider kit are taken care of by the same bulb. To switch to high beam, a magnet is activated that actually pulls the bulb closer to the engine so that it is farther away from the little reflector in front of the bulb.
Stand next to the VX and look down on the bulb from the top while someone switches the lights from low to high beam. Does the bulb move at all? If not then that could be your problem.
Now how do you fix it? I have no idea. 
Maybe the magnets are fried? Buying new bulbs might be the way to go as they really aren't that expensive.
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