There should be 3 or 4 screws holding tank on unless someone changed to bolts.
If you send me your email address I will send you a Parts manual for that motor, there should be a model # in front on top of transom mounting clamp.
Model # should be S 350 or S 351 the parts and motors are the same but will tell you exact motor you have.
If you need missing or broken parts I should have but will only be available through this Saturday but will be back mid November for a week.
Weather is starting to turn in the Northwest and I am going south to Arizona.
Doug Grell
Lauson 73
PS. email me at lauson4056