Unfortunately, the 123 C.C. engine makes them a "motor-driven cycle" in California. This means you have to register them annually at about 40 bucks per.
A moped (50 C.C. max) is registerd for as long as you own it for $5.00.
If I had a choice between a new Whizzer/Cruzzer and an old Honda CB125, guess which one I'd pick..
Jim