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Air cooled carburetted bikes don't NEED to run rich, they do so at certain points because of things like carb reversion. None of my plugs look like that and I own a whole buch of carburetted crap.
I'll second the notion that you should check the ignition system but I'll also add that you should take a look at the modifications done by the previous owner(s) (any jetting changes? muffler changes?) and double check that, after the carb rebuild, the mixture was set correctly. I like to see it set with a CO meter, which is more accurate than my ear/seat-of-the-pants/whatever. You may also find that the front cylinder and rear cylinder have different tuning needs. I'd try to make sure their flows are similar.
Good luck,
JR
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