|1978 Suzuki GS400X magazine ad from USA. Click to enlarge. "Our new GS-400X goes flat out without flattening your wallet." The GS400X was a cheaper model without the front disc brake, electric starter and gear indicator of the standard GS400. Here's the 1978-year's GS400XC. I found the advertisemement scan on eBay and I don't know what magazine it was published in.