2010 Arctic Cat DVX 300 / 300 Utility ATV Service Manual, Page 37Get this manual
Installing Top-Side Components APiston BCylinder 1Install the piston on the connecting rod making sure there is circlip on each side and the open end of the circlip is directed upwards or downwardsNOTE: The piston should be installed so the IN mark is toward the intake (rear) side of the cylinder
6Place the head gasket into position on the cylinderPlace the alignment pins into position; then place the head assembly into position on the cylinder making sure the cam chain is routed through the chain cavity
CAUTION
Keep tension on the cam chain to avoid damaging the crankcase boss
2Place the two alignment pins into positionPlace the cylinder gasket into position; then place piston holder (or suitable substitute) beneath the piston skirt and square the piston in respect to the crankcase3Lubricate 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