2007 Polaris Two Stroke Snowmobile Workshop Repair manual, Page 228Get this manual
REAR SUSPENSION IMPORTANT: The M-10 rear suspension has been designed to be very sensitive to rider weightChanges in rider weight of 25 lbsor more may require appropriate changes in FRA settingsReservoir Polaris recommends that you allow between 25 to 200 miles for the suspension to break in before performing any adjustments to the suspensionThis chart is guideline to be used for initial suspension setupsYour setup may vary based on your desired riding style
Upper Spring Retainer
Rider weight with gear (lbs Under 100 Suggested FRA Range (Lower number is softer) to 12 12 to to 12 12 to to 12 12 to to 5
Upper Spring
Center Retainer
100-150 150-200 200-250