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Snowcoaches and newer four-stroke snowmobiles are an improvement over the polluting two-stroke snowmobiles used in Yellowstone National Park for years, according to a new study.

YELLOWSTONE NATIONAL PARK, Wyo. (AP) - Four-stroke snowmobiles and snowcoaches are cleaner than the two-stroke snowmobiles that have been popular and widely used here for years, a study shows.

Polaris Snowmobiles has recently announced its 2023 snowmobile lineup. The range features better, faster machines, new hypersleds, the latest factory mod engine called the Patriot 9R, and the new ...