2011 Arctic Cat 350/425 ATV Service Manual, Page 43Get this manual
6If clearance is excessive, measure the journals of the camshaft
2If damaged, the camshaft must be replaced
Installing Top-Side Components
APiston BCylinder 1Lubricate the piston pin, connecting rod, and piston pin bore with motor oil; then install 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 arrow points towards the exhaust