The ProStar S4 is put to the ultimate test: Iron Dog race

In 1960 Edgar Hetteen, one of the three founding partners of Polaris set out on a 1,300 mile Alaskan expedition over 21 days to show the capability of the early snowmobile.

Now, almost 70 years later, a group of Polaris Engineers embark upon a journey putting the Prostar S4 engine to the ultimate test running the Iron Dog race.

12 DAYS The ProStar S4 conquered the Iron Dog course
7,650 MILES COMPLETED by the three S4 INDY Adventure sleds
342 HOURS of logged ride time
NO OIL was added or changed
ZERO MECHANICAL ISSUES for the ProStar S4 engine

Watch their story.