Re: ’68 Johnson 100 hp prop pitch/diameter?

[David Stanton]

It depends a lot on the boat and what you use it for. At the site below, find your motor in the table and look at the top of the chart for a key to the abbreviations as to which prop to use – it’s not a factory thing but it’s pretty good. Best way to tell if you have the right pitch prop is with a tachometer to see if you are in the factory recommended RPM range at wide open throttle. The site address says Evinrude, but same as Johnson – you knew that – I’m out of here!
Dave

http://www.propcopropellers.com/evinrud … d_Prop.htm