My 47 is running

[cubguy]

The past four days I have been working on my cub to get it running. I got all the valves lapped in and the mag working. Last night was the first time it ran for about 10 mins after the gover was unstuck. But it was running lean, so I clean it all and still running lean.(did that 3 times) So I take a jet out of a junk carb and it was diff. The one in the carb had no hole in the bottem and the one in the junk carb did. So I put that in the carb and runs like a top. So what up with the diff. jets?
Kyle

[Jim Becker]

By bottom, I assume you are refering to the tip, opposite the hex head. There has to be a hole there, as it is the actual jet. It is just full of junk.

[cubguy]

Heres are some pics.
http://i222.photobucket.com/albums/dd20 ... 1198199691
http://i222.photobucket.com/albums/dd20 ... 1198199765
Kyle

[Don McCombs]

That's called the discharge nozzle. A good explanation of "how stuff works" is contained here:

http://www.cleancomputes.com/Cub/Blue%20Ribbon%20Service%20Manuals/GSS-1411%20Service%20Manual%20for%20Cubs%20and%20Lo-boy%20Tractors/Section%202%20-%20Fuel%20System/index.html

[cubguy]

What I am looking that is the main discharge jet. The one that was in the carb has no hole. But I can't find out why?
Kyle

[drspiff]

Here are the 2 tubes. The one on the right is the bad one... Yes?



Is the stoppage brass? If it were insect remains, I can understand how they got there. I removed all kinds of debris from the '51 carb. But, from the picture, it almost looks like the tube has been brazed.

I can't imagine that happening when the tube was mounted in the carb. And I can't imagine doing that as a practical joke. One of the life's great unsolved mysteries. Keep it and mount it on a plaque to remind yourself that "strange things happen sometimes" or maybe "check and double check".

Rick (waxing philosophical) Dulas

[cubguy]

I looks like it was made like that. The holes on the sides are in diff. spots. What I can't understand is how it ran. Thanks drspiff. I guess I will keep it.
Kyle

[Jim Becker]

It is probably the result of doing mix and match with parts of several carburetors. I assume we are talking about an IH cub carburetor in this case. The part may have originated from a totally different carb. Some rebuild shops are real good at using any part that will screw in.

The opportunities to do something like this with the Zenith are almost limitless because there were so many versions of it.

[cubguy]

It is probably the result of doing mix and match with parts of several carburetors. I assume we are talking about an IH cub carburetor in this case. The part may have originated from a totally different carb. Some rebuild shops are real good at using any part that will screw in.

The opportunities to do something like this with the Zenith are almost limitless because there were so many versions of it.

Yes it is a IH carb. And that does makes sense, because someones been in the carb before.
Thanks Guy
Kyle

[beaconlight]

My friend Mike Murowski had a WWII surplus jeep. Something went wrong with the carb and he couldn't get the right parts. If I remember the name right Blue Streak in Long island City made carb parts and gaskets. I called them and eventually was told bring it in. I did and they said we don't have a kit for that carb but all the parts are available but you will need some from different kits. Then he reached into his sample draw and gave us 2 sets of everything including jets and float and a list of the various kits for each part.

[Buzzard Wing]

I have learned it can cause problems swapping carb parts, they used a whole lot of different parts through the years.

Seems like it shouldn't matter too much, but the main jet on the left wouldn't run right in my 49.


I just brought in two IH carbs from the garage that came with my new Lo Boy and I will crack em open soon... I bet the results will be interesting.

[Donny M]

This has been addressed before:
http://farmallcub.com/phpBB2/viewtopic.php?t=11406&highlight=discharge+nozzle

There are 3 different discharge nozzles I've come across.

[cubguy]

This has been addressed before:
http://farmallcub.com/phpBB2/viewtopic.php?t=11406&highlight=discharge+nozzle

There are 3 different discharge nozzles I've come across.

Thanks, It had the discharge nozzels without the hole in the end and it run lean. So it must be a difference which carb it goes in or the jet or the nozzels are a match set.
Kyle

[Donny M]

There is a matched set of three things for each carb, the main jet, the discharge nozzle, and the air bleed.