There were other disappointments. Golf cart sales sank to 2 percent of overall revenue by 1974, and were discontinued in 1975. Chain saw sales totaled $19.1 million in 1976, resulting in losses for the company and reflecting a flattening of future market potential. OMC discontinued them the following year. Snowmobiles, constituting about 4 percent of sales volume in 1972, were offered in 1973 with an optional Wankel engine costing about $235 more than the conventional motor. Though this was the United States's first introduction to the revolutionary rotary engine, OMC's hopes of success were dashed by heavy competition from other snowmobile brands, as well as by two winters of sparse snow. Snowmobile production came to an end in 1976, after a fiscal 1974 operating loss of $13.9 million.