My method uses a small, three gallon size plastic trash can, a piece of garden hose, a hose shut off valve and a set of earmuffs for the lower unit.
This set up allows the lower unit to draw antifreeze in and distribute it throughout the engine.
First I run the motor on a different hose and earmuffs for long enough to get the thermostat to open and the water to come out of the engine quite hot.
This may take fifteen minutes or so.
Once the engine is hot enough I switch to my bucket rig.
Starting with the bucket full of antifreeze, I run the engine and add more antifreeze as required until all the water coming out of the engine is bright pink.
It usually take about four to six gallons of antifreeze to get to that point.
As the last of the antifreeze is entering the engine I spray fogging oil into the carburetor throat until the engine stalls.
Then I remove all the blue plastic drain plugs from the engine.
I hope that helps!
YMMV
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