2011 Arctic Cat 366SE ATV Service Manual, Page 27Get this manual
MD1354A
3Loosen the cap screw on the end of the cam chain tensioner; then remove the two cap screws securing the cam chain tensioner assemblyRemove the tensioner assembly and gasket
6Using an awl, rotate the C-ring in its groove until it is out of the cylinder head; then remove the C-ringMD1245