I am trying to register my ride in california, Ive dowloaded the Motorized Bicycle Application and it asks for a vin for the bike which i believe is the number on the frame under the crank. But the engine number is what I am confused about, cant seem to find one, I have one of those Happy Times 80cc chinese engines, My question is do they have a number and where is it? or should I just make up one, nobody will probibly check it. Any help would be greatly appreciated, Thanks..... Mark