Need help identifying

[alanp]

Number on the carb is M311B. No tag on transom not even holes for rivots or screws to hold a tag. Other than casting numbers the only number stamped is in photo.

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[kees]

.
you should probably read "MS 11 B", instead of "M3 11 B"
if it is the correct carb….. the outboard is a model U Speeditwin from 1929 – 1930
good luck
.

[alanp]

Thank everybody for helping me out.

Alan

[garry-in-michigan]

The last one I saw raced (Dual carburetor, open exhaust, slimmer lower unit) was in 1949. He came in fourth in a field of twelve. Not bad for a model considered obsolete for 18 years . . .

[kees]

quote alanp:

Number on the carb is M311B. No tag on transom not even holes for rivots or screws to hold a tag. Other than casting numbers the only number stamped is in photo.

FYI
I found that number A44G also on my Speeditwin U 2978 and that is a 16 hp from 1928
the search goes on
make your choice , good luck
.

[alanp]

Thank you Kees and everybody else that gave me information. Now I know what I have. I collect and tinker with smaller outboards, easier on the back, so I don’t know much about larger outboards. I got it in a bundle I bought.
Were the Speeditwins used mostly for racing? Are they desirable motor or are they pretty common?

[lyks2tinkr]

Early Speeditwins are desirable motors.
The Evinrudes of the late 20s IMHO were decent performing and pleasing to the eye.
Yours is missing a few pieces but could be found.

[jimross]

Going by the exhaust manifolds and center gas tank filler it is a 1930.If it is a true 156 there is a model/ser. number on the lower portion of the crankcase underneath the intake manifold. Jim Ross

[alanp]

There us a raised number that looks like a casting number on the front A10U. On the side is another raised number cast in 100013. Nothing stamped or tagged.

[The Boat House]

• This reply was modified 5 years, 5 months ago by The Boat House.
• This reply was modified 3 years, 2 months ago by The Boat House.

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