Originally Posted by MitchB
May have answered my own question...
A call to CA DMV reveals any vehicle 25 years old or older is exempt from EPA / 50 state compliance.
If anyone has had a different experience, please advise before I spend any money..!
The California Air Resources Board (ARB) established emission regulations for on-highway motorcycles beginning with 1978-year models. Off-highway motorcycles must have an emission label affixed to the vehicle indicating certification by the manufacturer for on-highway use when converting to on-highway or dual registration. Registration guidelines for off-highway motorcycles converting to on-highway or dual registration require verification of the emission label.
NOTE: ATV OHVs cannot be originally registered for on-highway use or converted to on-highway registration, regardless of aftermarket conversion kits or added equipment.
Please direct questions regarding emission certification or labeling to the California Air Resources Board at 1-800-242-4450 or visit their website at www.arb.ca.gov
I'm not finding any documentation of this "vintage" rule. That's getting really recent these days. Plates on a CR500? Probably not. The bike will still have to have been sold for road use originally, at least, and at the time have been compliant with federal on-road emissions requirements for its year of manufacture.
Smog test exemption is stalled out at 1975 model year.