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That would be the last opposed cylinder Sportwin … model 4418 ❓
The carburetor (First designed in 1907) in easy to work of if not broken. Thousands were built, although hundreds have been scrapped, a few still turn up at garage sales. The three gaskets may e traced on gasket paper and cut out with a sharp Xacto knife. The needle valve packing was used on many models and is available from several sources. The cork float is sealed with lacquer which is dissolved by the alcohol in todays fuel. If in good shape, they may by cleaned with alcohol and then dried and sealed with super glue or fuel proof model airplane dope. If too far gone a replacement may be fashioned from a Mercury float …
The float valve should be able to shut off the fuel flow when it reaches 13/16" down from the rim of the float bowl. The check valve should seal he crankcase so fuel will not flow from the fuel passage at the rear of the valve seat. Be sure the passage is open when the valve is unseated or the outboard will not run. The primer lever will check this. Pushing the float pin (valve) down will flood the float bowl. But fuel should not drip from the air intake on the port side of the carburetor unless the check valve is unseated (raised). Valve lift is regulated by the cork bumper in the carburetor cover. This should be 9/64" for your Sportwin. I have found bottle stoppers than could be trimmed to fit in both grocery and hardware stores.
If you need seals for the gearcase, the new numbers are SKF5532 and SKF4770 … 😉
. . . Thank you MumblesDoes your motor look more like this one and what is the model number? This one is the ’48 4423 and later design while Garry’s information was for the ’41 to ’47 models.
That is model 4423 and although production started in November of 1947, it was ALWAYS considered a 1948 model. It was Irgie’s pride and joy. (Finn T. Irgins – Chief engineer at Evinrude since Steve Briggs bought Lockwood in 1929) He had Evinrude rent space on the University of Pennsylvania’s ENIAC computer to design the carburetor system. The first case of CAD (Computer Aided Design) for outboards in the world. ENIAC was designed during the World War Two to break coded enemy messages and was the first US fully functional "Turing Machine". Dr. Allen Turing wrote the specifications for the programable calculator in 1936. It took over seven years to realize his dream. The first test of ENIAC was a failure. Close examination found a moth caught in one of the relays. From that comes todays expression for testing new divices as "Getting the bugs out." My thought is, to err is human, but to REALLY screw up, you need a computer …
A cutaway of that infamous induction system … Many consider it unnecessarily complicated.
Since the high speed air intake can be open to the crankcase, the motor is most safely stored with the speed control in the stop position.
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