My first dumb boat question - 2 stroke, or 4?

[mythx]

First time boat owner here. I picked up an old 79 Starcraft 18' with a Mercury 50HP motor on it. The motor, I'm told doesn't run, but at least the boat itself is in great shape. Of course, I'd like to see if I can get the motor running too.

How do I tell if it's a 2 stroke, or 4? It's a 4 cylinder, has 2 carbs. Is there an easy way to tell? I feel dumb for asking, but aside from pulling the head, I'm not sure how else I'd be able to tell.

Once I know that answer, I'll need to figure out what kind of gear oil to use, and possibly also crankcase oil. If it's a 2-stroke, I think I only worry about using 2-stroke oil in the fuel.

Thanks in advance. I'm sure I'll be back with more questions.

 

[racerone]

It will be a 2 stroke.----Stop and read some manuals.------Talk to somebody before you launch the boat.-----Install a new water pump impeller too.

 

[mythx]

Thanks for the quick reply. I guess these are all 2-strokes?

Would you be able to point me to a good manual?

Thanks again