2008 Arctic Cat 400/500/650/700 ATV Service Manual, Page 223Get this manual
NOTE: If the journals are worn, replace the camshaft; then measure the clearance againIf it is still out of tolerance, replace the cylinder head
2If damaged, the camshaft must be replaced
Inspecting Camshaft Automatic Decompression SpringUnloader Assembly 1Inspect the spring, weights, and unloader for damage and freedom of movement
Installing Top-Side Components
APiston BCylinder
NOTE: If the piston rings were removed, install them in this sequence
AInstall ring expander (4) in the bottom groove of the piston; then install the thin oil rings (3) over the expander making sure the expander ends do not overlap