I have a 1998 Johnson 150 Ocean Runner Ficht on an Aquasport 200 Osprey.
Model # J150FSXECR
Serial # G04454558
MF Date 12/1997
hrs 320
I think that it has been "pinned" it has the small hex screw under each plug.
I have put the last 150 hours on the motor and it has run like a champ throughout...