Re: Retrofitting VRO to an early Motor.
The variable oiling is just one step towards making a cleaner running old engine.
I don't have delusions of making an old motor a current era 2 stroke, but I think a few steps can be done to update the operation of an old 65hp Johnson.
depends, if you spend more time at low speeds/idle, it will use less oil, but if you run at higher rpm it will use about the same.
on the average about 60:1 is the mix rate. at idle pre 90 used 150:1, from 90-92 it went to 100:1 at idle. after 93 it was oms.
just another thought though..ur '73..it was engineered for 50:1 all the time. leave it alone.