Hi all hoping my Aussie Yamaha collegues could help me out my 12yo son has just aquired a 1978 Yamaha GT 80 and what we were told was a MX 80.Now the GT has the id plate on the front yolk but the MX(?) has no plate but has a number on the frone of the forks that matches the engine number,Would anyone be able to ID the MX(?) from these numbers.Thanx Leith Button