Some brands of four-stroke snowmobiles include the Ski-Doo Rotax 1200 4-TEC, Polaris Switchback and Arctic Cat 9000 C-TEC4, according to their websites. The same manufacturers offer other four-stroke models.
The engines offered by Ski-Doo utilize iTC technology along with their four-stroke capabilities, states the Ski-Doo website. The combination leads to greater fuel economy and increased throttle response.
The Polaris Switchback models feature different options, but many feature high-efficiency intakes and exhausts, lightweight crankshafts and improved durability, notes the Polaris website.
The 9000 C-TEC4 four-stroke engine by Arctic Cat features an electronic fuel injection that is able to produce 177 horsepower, making it ideal for higher elevations, reports the Arctic Cat website.