1998 Mercury 9.9/15HP 4-stroke outboards factory service manual, Page 310Get this manual
BIG FOOT
Cam Follower
1Inspect cam follower for wear or gallingIf wear is present, inspect corresponding shift cam for wearReplace if worn
1Replace clutch if jaws are rounded or chippedRounded jaws may be caused by the following: Improper shift cable adjustment or linkageEngine idle speed too high while shiftingShifting too slowly from NEUTRAL into FORWARD or REVERSE