2007 Arctic Cat ATVs 400/500/650/700 Service Manual, Page 341Get 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 ! CAUTION
The cylinder should slide on easilyDo not force the cylinder or damage to the piston, rings, cylinder, or crankshaft assembly may occur
4Loosely install the two nuts which secure the cylinder to the crankcase
7Place the head gasket into position on the cylinderPlace the alignment pins into position; then place the head assembly into position on the cylinder
NOTE: The two cylinder-to-crankcase nuts will be tightened in step 10