Most older motorcycles do not have a built-in rev limiter. Rev limiters are electronic or mechanical devices that prevent an engine from exceeding a certain RPM (revolutions per minute). They are commonly found in modern motorcycles and cars to protect the engine from damage caused by excessive RPM.
These devices are not typically built into the original design of the motorcycle but are added for specific purposes such as competition or engine protection.
If you have a specific model of an old motorcycle in mind, it's best to consult the manufacturer's documentation or speak with an expert or mechanic familiar with that particular bike to determine if it has a rev limiter or any aftermarket modifications.