Well KawAbuser, the dynamo of technology rolls on...it makes sense to use a magnet to do the job of a spring if the magnet can do the job better. For valvetrains, the computer technology is there now. Using digital fuel injection to replace carbs is a good comparison, except that the potential for performance gains is greater if some major limitations of valvetrains can be overcome, than with carbs.
What holds electromagnetic valves back right now is that the technology for magnetic materials is not there yet to make them work for motorcycle engines. In ten or twenty years, who knows? Breakthroughs happen.
One safe bet is that the Hayabusa and the ZX-12 will not be the fastest bikes ever built. What type of ultimate performance streetbike do you think we will be able to buy 20 years from now? I have a guess. What kind can I get today, and what kind could I get 20 years ago? Think that much farther ahead of the hottest bikes today, (maybe a little more since technological improvement seems to speed up over time) and that's it. A bike pretty far ahead of the Busa and the 12. I like this evolution thing, personally.
[This message has been edited by Mr Bear (edited 08 February 2000).]