Chris Huhn, the owner of VMX (the bike parts biz, not the magazine) decided he wanted to do something else, and so he closed up shop in mid November. I've been in contact with him since and he has almost nothing left in the way of parts. Instead, I'd recommend you take your business to AMS Racing in Arizona. They've generally got everything you could want.
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'81 490 Maico (King Kong!), 2000 CR250, 74-1/2 GP400 Maico, buncha street stuff