ANTIQUE OMC OUTBOARD IDENTIFICATION

[keplerfan]

I just picked up this omc motor today. The serial number is 407208 3. The starter pulley says "outboard motors corp. It is an opposed twin that does not have a magneto. Instead, it has a setup like a Ruddertwin where you need a battery for spark.

Any ideas?

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[kees]

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model 407 is a Lightwin , year 1932 , 4 hp
good luck
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[lyks2tinkr]

I have the 31 Elto Lightweight version of that motor. Great runner. I love the AK battery ignition sytem.

[The Boat House]

With that battery ignition I believe
your motor is a Model 401 Lightweight.
The punch doesn’t look like it was square on tag when stamped.

[keplerfan]

When looking at it closer it does appear to be a 1 instead of a 7 but it is hard to tell . What is the difference in year?

[keplerfan]

When looking at it closer it does appear to be a 1 instead of a 7 but it is hard to tell . What is the difference in year?

[kees]

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model 401 is from, 1931
its a Lightweight and also, 4 hp

btw.
I have a model 401 in my collection
and that has a flywheel magneto and has NOT a coil for battery ignition !
was that an option ?? your choice , I dunno.
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[keplerfan]

It has an angle like a seven but on the bottom you can see what looks like the partial base of a one. baffling. is there another feature on this motor that could tell me what it is?

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[kees]

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Please, can you post a picture of the lower unit
and also of the backside of the power head with the muffler
then I can see if there is a difference between the flywheel magneto or the coil for battery ignition model
thanks
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[keplerfan]

here is a pic of the exhaust manifold and lower…

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