2003 Arctic Cat ATVs from 250cc to 500cc Service Manual, Page 365Get this manual
3Lubricate the inside wall of the cylinder; then using ring compressor or the fingers, compress the rings and slide the cylinder over the pistonRoute the cam chain up through the cylinder cam chain housing; then remove the piston holder and seat the cylinder firmly on the crankcase 4Loosely install the two nuts which secure the cylinder to the crankcase NOTE: The two cylinder-to-crankcase nuts will be tightened in step 10