Correct prop for mid-60's 18HP Johnson?

[Elkins45]

I have my dad's old 18HP Johnson Fastwin but unfortunately the prop has somehow gone missing. What's the correct prop to run this motor on a 1648 Jon boat? I also need shear pins and a prop nut, correct? Are those a standard size?

Thanks in advance of any help.

 

[tphoyt]

You will need to do a little research with your model number. You may find one here on IBoats.

 

[F_R]

Johnson 18's were produced 1957-1965. A 1965 came from the factory with a 9-1/4 X 11 three blade aluminum prop. They figured it was good for the average boat the motor was likely to be used on.