This was actually the first "SR" model released. The D1 may have been sold only in Japan but this is unknown. It featured a lot of the equipment from the C model but with a different frame, the substitution of a 16-inch rear wheel, deletion of the tailpiece (which was such a trademark of the B/C models) and an entirely different seat with a "tuck and roll" appearance to give it the full-on "chopper" look. As well, the fuel tank shape was completely different from the B/C models and more in keeping with the "chopper" look. As well, the D model featured rubber mounted two bolt style footpegs. All other models used a single bolt rigid style peg setup until the 1979 models. All D models also included a "Low Fuel" warning light incorporated into the tachometer faceplate. The D1A was a US-only model with 22 mm carburetors, as opposed to the 24 mm items fitted to units sold elsewhere. Power output was reduced to 58HP (SAE net at the crankshaft) at 8,000 RPM . This change was probably due to emission requirements in the US market. All other aspects and equipment of the D1A construction were identical to the D1 models sold outside the US. Everyone was riding KZ650's, the SR650 was an upgraded version of the KZ650.