2000 Polaris Indy 500 / 600 snowmobile service manual, Page 321Get this manual
BRAKESFINAL DRIVE SprocketChain Combinations SprocketChain Combinations58 Chain Case Acceptable gearingchain combinations are listed below for the 6.625 (center distance) chaincaseDo not use this chart for models with 7.05 chaincase Refer to page 8.5 for 7.05 chaincaseRefer to Specifications section of chapter for chaincase center distance by modelCombinations listed as "not recommended" should not be installedUpper Sprocket (# of Teeth) 16 16 16 16 16 17 17 17 17 17 18 18 18 18 18 19 19 19 19 19 20 20 20 20 20 21 21 21 21 21 22 22 22 22 22 23 23 23 23 23 24 24 24 25 25 25
Lower Sprocket (# of Teeth)