2009 Polaris Scrambler 500 4x4 2x4 factory service manual, Page 147Get this manual
CLUTCHING 5Inspect belt for loose cords, missing cogs, cracks, abrasions, thin spots, or excessive wearReplace if necessary6Inspect belt for hour glassing (extreme circular wear in at least one spot and on both sides of the belt)Hour glassing occurs when the drive train does not move and the drive clutch engages the belt
DRIVE BELT INSTALLATION
Center Distance Clutch Center Distance 10 +.1-.05 (254 +2.5-1.3mm) Belt Nominal Length40.875 316 (103.8 cm .48 cm) 7Measure 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 deflection