I don't have the link in front of me, but go to the VMX magazine web site (www.vmx-mag.com) and wander over to the Links page. It's okay to drool over some of the bikes shown first. Anyhow, there's a YZ web site that seems to be the place for all things YZ.
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'81 490 Maico (King Kong!), 2000 CR250, 74-1/2 GP400 Maico, buncha street stuff