1997 Johnson Evinrude "EU" 90 thru 115 90 CV Service Manual, P/N 507267, Page 202Get this manual
NoteThe clutch dog is not symmetricalIf installed backward, it will not fully engage reverse gear and will immediately damage itself and the gear
13V4Install the clutch dog on the propeller shaft: face the splineless lugs aft, and align its hole with the slot in the propeller shaft
14V6Align holes in the clutch dog with slot in the propeller shaftInstall the clutch dog on the shaft with "PROP END" facing rear of the shaft