2007-2011 Polaris IQ Snowmobiles Service Manual, Page 328Get this manual
PVT System Belt-to-Sheave Clearance Adjustment
Belt-to-sheave clearance is an important factor when evaluating drive clutch performance as it controls the starting drive ratio and the position of the drive clutch weights in relation to engine RPMIf the clearance is too small, the drive belt will drag on the face of the sheaves when the engine is at idle speedIf the clearance is too large, the belt will slip during initial engagement causing belt burning and low-speed engine bogging
= In mmBelt-to-Sheave Clearance Nominal.020in(0.508mm) Range.005.035in(0.1270.89mm) Belt-to-sheave clearance can adjusted by installing different drive belt, or by adding or removing shims washers) located under the spider assemblyTo measure belt-to-sheave clearance, follow these steps: 1Verify the drive clutch sheave faces are clean and the drive belt is in good condition, and not damaged or excessively worn2Push the drive belt tight against one side of the drive clutch sheavesMeasure the opposite side gap using feeler gauge3A slight very drag should be felt when inserting the feeler gauge between the belt and sheave face4Compare measured gap to the specificationThe distance between the moveable and stationary clutch sheaves and thus the belt-to-sheave clearance is determined by the number and thickness of the washer(s) installed between the spider and clutch spacerTo increase the clearance, add or install thicker washer(s)To decrease the clearance, remove or install thinner washer(s)Either way, belt-to-sheave clearance adjustment most often requires the spider to be "reindexed"