Ayuh,.... For the steam cleanin' to work, ya need a warmed up motor, turnin' 'bout 1500 rpms or so,....
Then dump a 16oz. soda pop bottle of water down the throat of the carb,...
Ya need to pour it fast enough to "
Labor" the motor,....
The neck of the bottle helps ya regulate it, ya almost can't pour it too fast, as the bottle gulps for air,...
I learned the trick way back in my British years,... 1st Austin Mini's, 'n later Series Land Rovers,...
It's right from the British Leyland Shop manuals of the day,....
I've done it on a few motors I knew were bein' torn down for repair(that still ran)...
The combustion carbon is
Gone,... Clean cast iron, steel, 'n aluminum,.... Nothin' to clean up after the tear-down,...