1961 75hp prop question

[Marioleonard]

I have a 1961 75hp johnson and she came with 2 prop's. I have attachet 2 pic's one is of the prop two props and the other is the lower unit. They both have the same pich and everything. the smaller one is the on that was on the motor. help

 

[steelespike]

Re: 1961 75hp prop question

Diameter should be 10" measure from center of the bore to the tip of a blade
multiply by 2.Prop hub should be the same diameter as the gearcase.

 

[Marioleonard]

Re: 1961 75hp prop question

they both fit my motor. I was just wondering why the other on look bigger? and wich one I sould use if they both have the same pitch

 

[F_R]

Re: 1961 75hp prop question

they both fit my motor. I was just wondering why the other on look bigger? and wich one I sould use if they both have the same pitch

They will both work. Use the one that performs best on your boat/load. Of course, they take different prop nuts. But you can use the small nut on the big hub in a pinch.

The short version of a long story is that the small hub prop was designed for the 60hp to help it carry a heavy load. But it will give the same advantage on your 75.

 

[Marioleonard]

Re: 1961 75hp prop question

so what would the other prop be best for? and thanks you guys this is my fits outboard. I mostely work on i/o or jet boats. I like the motor and i will only use johnson/evinrude motor cause that's what my grandfarther always used. You guys know your stuff.