Polaris 2006 Edge Snowmobiles with 121 Track - Manual (Page 52)

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THE PERFECT FIT
FAST M-10 Rear Suspension Adjustments
Other Ride and Performance Settings
Optional Springs
Optional springs have been designed to allow adaptation of the M-10
suspension to your specific needs. The 140 lbs./in. optional front arm
spring would be used when very light load conditions exist, such as
operation on very smooth trails, in deep powder or by very light riders.
The 300 lbs./in. rear arm spring option would be used when high load
conditions exist, such as operation by heavy riders on rough trails or
very aggressive riding. The available springs for M-10 suspension are
listed below.
LOCATION SPRING RATE POLARIS PN
Front Arm Standard
Front Arm Soft
Front Arm Firm
160 lbs./in.
140 lbs./in.
180 lbs./in.
7041671-216
7041677-067
7041672-067
Rear Arm Standard
Rear Arm Soft
Rear Arm Firm
210/278 lbs./in.
135/240 lbs./in.
300 lbs./in.
7041935-216
7042010-216
7042011-067
Overload 1000 lbs./in. 7041936-067