Polaris 2001 High-Performance Snowmobile Service Manual (PN 9916690), Page 91Get this manual
ENGINE Assembly, Cont9Lubricate pistons, rings, upper rod bearing, and cylinders with two stroke oil and install cylindersAlign ring end gaps with locating pins and compress ringsInstall cylinder carefully with gentle front to rear rocking motionLoosely install cylinder nuts
10Install new cylinder head O-ring and install cylinder headMake sure O-ring is properly seated in groove