This 91mm cylinder bore piston and gasket kit is designed for engine replacement applications.It includes 2 pistons, 2 head gaskets, 2 base gaskets, 2 piston pins, 4 circlips, and 2 complete sets of piston rings.Compatible with select BRP 1000 models from 2011–2017, including variants such as 1000R, Max 1000, Max 1000R, HD10, and HD8 where applicable.Fits engines requiring replacement of part numbers 420929650, 420845109, 420845107, 420845106, 420685714, 420685244, 420630850, 420630210, 420630195, 420613587, 420613586, 420613584, 420613583, 420613582, 420613581, 420413431, 420413430, 420296775, 420296774, 420296770, 420216272, and 420216270.Designed to provide proper fit and function in compatible engines.