Papa, if you're racing AHRMA, the XL qualifies as Post Vintage, the new name for these newer bikes, and it would be entered in the Ultima class. The CR500, if it has disc brakes, would be ineligible. Local racing organizations would probably have some classes where either bike is okay. "Vintage" like "lite beer" is an overused and under-defined term. I'm an AHRMA regional coordinator, and can put you in touch with someone in your area if you're interested. Email me at markthomps@juno.com
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'81 490 Maico (King Kong!), 2000 CR250, 74-1/2 GP400 Maico, buncha street stuff