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Your location in Ontario ?----What marina quoted you the high prices.----I may know where to find the parts.

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Remove shift cable at the motor.-----Find the hitch pin on that horizontal shaft below the carburetors.----Remove that hitch pin.------Push that horizontal shaft to the port side and rotate it.----Shift rod is now loose.

See if you missed any nuts above the prop.

When choke plate is closed a very low pressure develops in the carburetor when you pull the rope.----Then the atmospheric pressure in the float bowl floods the carburetor throat with fuel.

How many nuts / bolts on your work bench ?----Trim tab is out of the way ?

??----A 1972 model 125 HP Evinrude listed at 252 LBS in the brochure.

Walking around your motor or jumping up and down won't help.----Take it apart and examine bearings with a magnifying glass.

They are just standard bearings.----Take the unit apart for inspection.-----I do not consider those gearcases to be robust.

I think the important block dimensions are the same.-----Doubt you will be able to find / afford new parts if 56 is the only thing that will fit.

Find a donor motor with the parts.-----1956 to 1976 with the 22 cubic inch block.---18 / 20 / 25 HP ------Best way to go.

I have worked on lots of motors.-----That amount of rust indicates water / moisture was in there.-----How it got in there and over how many years is hard to tell.

Those wee handy pumps come with a 3/8-NC thread.-----Very handy to pump oil into the lower unit.----That would be the most common one on the boat shop shelf.-----Not hard to find.

They had a production run of X number of motors.-----Sold the same motor for a number of years.----Then a new production run.------Not much different than what others did over the years.

I think most boating people know that these motors run at 50:1.-----And that has been so since about 1964 model years.-----Not secret information.

Rain water would simply drain down into the engine block / cylinders via the exhaust housing.

Does not matter as the 2 wee nipples both put out the same amount of fuel when primer valve is open.

50 parts gasoline for 1 part oil.-----Seller likely is flipping the motor if he does not know ratio.----Or if he has been running it then did he do damage ?

Lets start with the model # for this 1954 ?? 18 HP motor.

Fuel should PULSE out.----It does not pump with a steady stream.