1996 Mercury Force 25 HP Service Manual 90-830894 895, Page 64Get this manual
3 Place locating rings on connecting rod, carefully place piston over end of rodRefer to scribed identification number for matching rod to piston and direction of assembly (which side of rod is "UP")
Eye protection must be worn while installing piston pin lock rings6
Install new piston pin lock rings in grooves in both ends of pistonMake sure lock rings are properly seated in piston grooves.4
CAUTION
Do not re-use piston pin lock ringsUse only new lock rings and make sure they are properly seated in piston grooves