My 1986 15hp. Johnson has a lever that will allow the motor to be run shallow so you can get in to spots that would not be possible otherwise. This used to work fine, I'd push the lever and raise the motor and it would lock in the shallow position. Now I do this and it never seems to engage and hold the motor up. Is there someway I can get a view of the parts used to do this so I can tell what needs to be fixed or adjusted? Thanks!!