Posted by maybe knot on 02/11/07 - 10:04 AM
#1
what pitch and size of propellar would be correct on a 1978 70 hp johnson
Posted by Joe Kriz on 02/11/07 - 10:48 AM
#2
I used a 13 3/4 x 15 pitch OMC prop on my 1985 Evinrude 70hp.
Your wide open throttle RPM's should be between 5,000 and 5,500 when you have a light load.
Posted by Tom W Clark on 02/11/07 - 5:03 PM
#3
It depends on what boat the motor is mounted on and where and how you use it. Without that information, no good recommendation can be given.