2001 Polaris Sportsman 400-500 DUSE and H.O. Service Manual, Page 204Get this manual
DRIVE BELT REMOVALINSPECTION, CONT7Measure belt length with tape measure around the outer circumference of the beltBelts which measure longer than nominal length may require driven shimming or engine adjustment for longer center distance to obtain proper belt deflectionBelts which measure shorter than nominal length may require driven shimming or shorter center distanceRemember, proper belt deflection is the desired goalnot specific center distance8Replace belt if worn past the service limitBelts with thin spots, burn marks, etc should be replaced to eliminate noise, vibration, or erratic PVT operationSee Troubleshooting Chart at the end of this chapter for possible causesNOTE: If new belt is installed, check belt deflectionCenter Distance Clutch Center Distance 10 +.1-.05 (254 +2.5-1.3mm) Belt Nominal Length40.875 316 (103.8 cm .48 cm)