|1980 Suzuki GT125 / X-4 magazine article from France, published in a magazine called Moto-Journal (a single page plus specs and prices). Click to enlarge. This article was scanned and sent to me by
Fabrice Garriga, France. Unfortunately I can't read French so I don't know what it says, but the numbers are pretty International anyway. The GT-125 was called X4 in France.