So I buy this bike from a guy who tells me its a z1 900. Vin check shows its a 76 kz900 a4. So its not really a z1 or is it? The motor says z1e.... and the frame is similar z1f... Also the forks aren't off that model and the carbs appear to be off a 77 because of the idle screw position. The wheels are grey mags. Point is do I have an amalgamation of a z1 and a kz or... is it all the same?