2006-2008 Polaris Snowmobiles FS/FST Service Manual., Page 201Get this manual
PVT System Spider Indexing
NOTE: Spider indexing effects belt to sheave clearance and clutch balancePlease read all procedures before proceeding12Remove and disassemble clutch Add or remove spider washers as required to achieve desired belt to sheave clearanceMake sure that the stepped washer (A) is on the bottom of the spacer stack (B)For example: If belt to sheave clearance is .020 too large, removing one .020 shim will position the movable sheave closer to the fixed sheave reducing belt to sheave clearance by .020 Place the correct number of spacer washers (B) beneath the spiderThe following washers are available for fine tuning: 5210752.020 (.51mm) 5242981.025 (.63mm) 5210753.032 (.81mm) 5210754.050 (1.27mm) Clutch Spacer.130 (3.3mm)