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Johnson marketed a 10 in 49----Evinrude started that in 56 with a 10 HP.-----Not all models were the same between the 2 divisions in the early years.-----Up to 57 the 10 HP used the 18 HP gearcase.

Evinrude 10 HP was from 56 to 63 model years.

Rotary valve is just holes drilled in the crankshaft.

Try a 21" pitch.

Short driveshaft should be easy to find.

Have you adjusted the low speed mixture screw that feeds the rotary valve ?

The upper and lower half of the gearcase are machined as a unit .----Considered to be one piece.----You may get lucky just replacing the bottom part.-----Was it cracked due to water freezing ?-----Take it apart to inspect gears and bushing above pinion gear.----This will be costly if you need a...

So run with a timing light.----See which of the 2 separate ignition systems has the issue.----If in fact it is an ignition miss.

Do a complete evaluation of this motor before you spend any beer tokens on it !

Crankcase compression should build up in a matter of seconds in the tank.-----Perhaps time for a rebuild kit for the tank.

Agreed----Notching the crankshaft is NONSENSE !!!-----But sticking some 2 barrel carburetors on the 3 cylinder loopers really wakes them up.

The primer button on a 2 hose tank does NOT build up pressure in the tank.

Can you post what make / model motor is involved here ???

What ring gap do you have ??-----Why do you feel it needs new rings ?

Propane torch and heat the housing.----Aluminum expands at twice the rate of steel.-----Screws usually come out.

They will need a few more of these plants to charge the batteries on millions of cars / trucks in a few years.----Amazing how little knowledge is out there on how much electricity is needed to run all the green / electric stuff.

Be the same rings as a 5.5 Evinrude / Johnson I believe.---------In Canada----evinrudeparts.ca------

Turn the unit up-side down.----Try and poke the driveshaft up and into the pinion gear.----Works for me every time.

The junk went through the carburetor throat.-------That venturi creates the low pressure for fuel to be drawn through metering circuits and into the airstream.-----So no , this junk did not get into the " working innards " of the carburetor.-----As the OP stated he is not fully versed on the...

???----You can have zero compression in one crankcase and still show 120 PSI in the that cylinder.----Checked the reed valves ?