2001 Polaris Sportsman 400-500 DUSE and H.O. Service Manual, Page 219Get this manual
OPERATION GUIDELINES FOR EBS CLUTCHES
& EBS clutches have slightly higher starting gear ratio between the drive and driven clutch due to the location of the one-way clutch on the clutch shaftFor best performance and belt life, always use low-range in hilly terrain and when towing or hauling loadIn fact, High Range should only be used when traveling on level ground with light or no loadEBS kits are recommended for models equipped with HighLowReverse transmissions onlyEngine braking is enhanced when operating in low rangeWhen an operator makes the transition to and from engine braking engagement, the driven clutch helix changes from the acceleration side to the deceleration sideAn audible engagement noise may be heard during this transition and is normal conditionChanges to drive clutch calibration are recommended if the vehicle will be operated at elevations above 3000 ft (900 meters)Refer to the model specific clutching chart for type of drive clutch weight andor drive clutch spring to install for high elevation