Polaris 2001 High-Performance Snowmobile Service Manual (PN 9916690), Page 99Get this manual
ENGINE Assembly, Cont12Install new head and head cover O-rings
13Install heads and torque to specification found in beginning of this chapter14Install head covers and torque bolts to specification15Install outlet manifold and torque bolts to specificationHead Cover Bolt Torque: 22-24 ft.lbs (30-33 Nm) Outlet Manifold Bolt Torque: 5-6 ft.lbs (6.9-8.3 Nm)
Reed Valve Inspection
16Measure air gap between fiber reed and reed block as shownThe air gap should not exceed .015 (.4 mm)If clearance is excessive DO NOT attempt to reverse the reeds to reduce the air gapAlways replace them if damagedCheck each fiber reed for white stress marks or missing materialReplace if necessary