Polaris 2006 Edge Snowmobiles with 121 Track - Manual (Page 41)

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THE PERFECT FIT
EDGE Rear Suspension Adjustments
Torsion Spring Tension
To adjust rear torsion spring tension, rotate the three-position cam using
the engine spark plug tool. Different rate torsion springs are available if
a firmer ride is desired. See your dealer for more information.
Soft Tension Medium Tension Firm Tension