What is the requirement of CC and seat height or is their any at all for a motocycle to be street legal if it has turn signals and brake lights and head lights is it street legal as long as you are?
This answer will vary state to state, provided you live in the US, for the requirements at your local Department of Motor Vehicles.
Absolutely not. Before flashing lights were put on cars, hand signals were all that was available to indicate a turn. In fact, hand signals were once required (in Louisiana, at least) even if your vehicle had flashing signal lights. It's important to know and be prepared to use hand signals in the event your signal lights malfunction. Source: common sense