Yamaha Outboard Motors Factory Service Manual F6 and F8, Page 302Get this manual
CRANKSHAFT, PISTON AND CYLINDER BODY INSTALLING THE PISTON RING
1Install: Oil ring 2nd ring Top ring 3
When installing oil ring, first install the expander ring and then the side railsWhen installing the 2nd ring and top ring, make sure the "N" mark faces upwardAfter installing the piston rings, check that they move smoothly
2Set: Set the piston ring end gaps as shownTop ring end gap 2nd ring end gap Oil ring Upper side rail end gap Oil ring expander ring end gap Oil ring lower side rail end gap d