Some information I found from DMV:
www.dmv.ca.gov
"To be eligible for on-highway registration, your OHV must be manufactured for both on and off-highway use.
Motorcycles manufactured after 1978 with an engine size of 50 cc or larger must have a label indicating that the vehicle meets CARB emission standards and a manufacturer’s certification for on-highway use.
ATVs do not meet federal standards for on-highway use and cannot be converted.
If your OHV has a red ID plate, it cannot be registered for on-highway use.
Exceptions:
Off-Highway Vehicle Registration - California DMV
Off-Highway Vehicles (OHVs) are used only on lands that are open and accessible to the public. OHVs must display an ID plate or placard issued by the DMV.
![www.dmv.ca.gov](/proxy.php?image=https%3A%2F%2Fwww.dmv.ca.gov%2Fportal%2Fuploads%2F2020%2F02%2Fcropped-dmv_favicon_Final_png-1-32x32.png&hash=298af64f3a9b9ee92069eb016f365563&return_error=1)
"To be eligible for on-highway registration, your OHV must be manufactured for both on and off-highway use.
Motorcycles manufactured after 1978 with an engine size of 50 cc or larger must have a label indicating that the vehicle meets CARB emission standards and a manufacturer’s certification for on-highway use.
ATVs do not meet federal standards for on-highway use and cannot be converted.
If your OHV has a red ID plate, it cannot be registered for on-highway use.
Exceptions:
- Motorcycles manufactured before 2005 with an engine size of less than 50 cc are exempted from emission label requirements.
- Motorcycles manufactured after 2006 with an engine size of less than 50 cc may have a label indicating that they meet U.S. Environmental Protection Agency (EPA) standards for on-highway use in lieu of a CARB label."
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