Topic: 1928 Fastwin & Fleetwin Carb questions – Antique Outboard Motor Club,Inc

This topic has 19 replies, 5 voices, and was last updated 2 months, 4 weeks ago by Buccaneer.

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August 20, 2024 at 12:54 pm #289984
Buccaneer
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Got some brass 1/8″ pipe plugs yesterday, so decided
to work on the carbs again for the 28 Fastwin.
Trying to get the smaller Fleetwin carb? and the correct Fastwin
carbs useable.

I’m wondering if anyone has some good photos of what the
choke and throttle levers looked like.
See photos for details.
Thanks.

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August 22, 2024 at 9:17 am #290051
george-emmanuel
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First off, I would highly suggest you not use a pipe plug in lieu of straight-thread plugs with washers. Those carbs are fragile castings. A pipe plug is tapered and puts side pressure on the threads and will bust the casting. On the areas where there are jets, the threads are for the jet, and the plug is the same thread. If you use a pipe plug you will change the thread pitch and never be able to remove the jet.

My motors are in a warehouse and as soon as I can, I’ll take a picture of the air horn and its choke lever. But, here is the page from the parts manual…The choke quadrant is shown and has a, for lack of a better word, cover that has a detent in each end. The choke lever has a spring-loaded pin that pops into the detent to hold the choke lever in either the on or off position. Both are usually broken. Art DeKalb used to make the castings for those.

I have placed arrows to indicate the parts and also an arrow showing where the spring-loaded pin goes.
August 22, 2024 at 9:49 am #290053
Buccaneer
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George, Thanks for the manual page! I’ll take a look at
the carbs later today and see if I can figure out what
suppose to be there, taking your print along.

The only spot I put in an 1/8″ pipe plug instead of the 5/16″ x 32 plug,
was on the carb bowl drain, where there was lots of “meat”.
I realized the dilemma with the plug with the threaded jet,
and made an aluminum plug with a 5/16 x 32 die. My brass
round stock was undersize, and I failed trying to make an oversized plug
on the lathe.

Thanks.

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August 22, 2024 at 12:10 pm #290073
george-emmanuel
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I went to my warehouse and took 2 pics that should help. You’ll notice I wrote “run” in that quadrant due to the letters being so worn.
August 22, 2024 at 1:53 pm #290081
Buccaneer
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Thanks George!
Perhaps I can make something to function in the same way,
but I don’t think it will look original!

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August 22, 2024 at 5:25 pm #290090
Buccaneer
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I’m not sure of all the differences between the 1928 Fastwin H 12hp
I’m currently working on, and the 1929 ish Fastwin 14 hp I also
recently acquired, but the 29 has a choke lever like yours, but
of course the “half moon” detent cage is 90% “gone”.
Now that I seen your photos George, it all makes sense.

I noticed in the specs that both above mentioned motors have
the same bore and stroke, and their HP both rated at 4000
RPMS, so I’m not sure what they did to increase it two HP
in 1929? Carburetion, prop?

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August 24, 2024 at 9:05 am #290142
george-emmanuel
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Not being a technical person, the only thing I can figure is maybe the exhaust design ( small opening at gearfoot) had something to do with it. I do know that the underwater exhaust made it more difficult to start. All most every ’29 Fastwin and Speeditwin I’ve seen has had relief holes drilled in those beautiful cast housings to relieve pressure…..Meanwhile, Finn Irgens 29 Lockwood Chief had the bigger exhaust going into the lower unit. Maybe that’s why Evinrude/ELTO wanted him so much?

George
August 24, 2024 at 12:05 pm #290144
Buccaneer
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George, interesting about the “exhaust” system and horse power.
I didn’t think about the 28 being “above water” exhaust, and
the 29 “underwater” exhaust, and how the designs might
effect HP.

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August 24, 2024 at 12:34 pm #290145
Tom
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I don’t recall where I read this, but I believe the exhaust scavenging of the ’29 underwater exhaust helped horsepower. Also, you need the air horn in place for easier starting. There’s a slug of air/fuel that gets blown out when starting that is lost if the air horn is not present. My ’29 starts pretty easily if I fill the carb, then shut off the fuel until it’s running.

Tom
August 24, 2024 at 5:56 pm #290149
Buccaneer
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Tom wrote:

I don’t recall where I read this, but I believe the exhaust scavenging of the ’29 underwater exhaust helped horsepower. Also, you need the air horn in place for easier starting. There’s a slug of air/fuel that gets blown out when starting that is lost if the air horn is not present. My ’29 starts pretty easily if I fill the carb, then shut off the fuel until it’s running.

Tom

Seeing how the choke plate is in the air horn, I would certainly
think it would be a bonus having it on.

I suppose the underwater exhaust could act like an eductor,
helping to pull out / scavenge exhaust out of the engine?

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