Honda BF9.9A-BF15A Outboard Motors Shop Manual., Page 26Get this manual
HONDA BF9.9A-BF15A
Hard shifting
Shift rod rnisadjusted (P.3-6)Shift rod wornShift spring weakClutch shifter dogs worn
Contaminated gear case oil
O-ring and water seal faultyGear case improperly tightened