the 1971 Johhson Pegasus, did 141 on the Bonneville Salt Flats ( I was going to not post this, but hell, anything that makes a pass at B-ville deserves recognition)

The 1971 Johnson Pegasus on display exemplifies this quest for power best of all, as the machine was used to set a land speed record of 140.625 MPH at the Bonneville Salt Flats (the surface of which behaves much like hard-pack snow). Featuring dual V-4 engines and a streamliner body, the sled first achieved this milestone in testing, prompting participants to hastily arrange officiating. While the body and chassis were developed for the record attempt, and the track was specifically engineered by Goodyear for high-speed runs at Bonneville, the rest of the record-setting snowmobile is said to be constructed from off-the shelf components.

http://blog.hemmings.com/index.php/2013/11/04/celebrate-winter-with-vintage-snowmobiles-at-the-aaca-museum/