Fri Feb 25, 2005 11:34 am
Fri Feb 25, 2005 11:44 am
Replacement tubes are still available. With a little care, you can get the old one out.
Fri Feb 25, 2005 1:10 pm
BD is right, It can be done...just requires patience That is why we never allow pilots near the aircraft with tools
Fri Feb 25, 2005 1:18 pm
Broke mine doing my fixes like in lurker carls web page. I got to excited when I split the 2 halves of the carb for like the 15 time checking fit oops I broke it. I want to say it was $11 or $14 for the tube. I had to drill just undersize by had not with a drill do it by hand. Then I re-tapped the hole it is a #4-48 fine thread.
do not worry it is an easy fix
Fri Feb 25, 2005 2:48 pm
That is why we never allow pilots near the aircraft with tools
Point well taken. And agreed. I stick to cubs, don't worry!
Fri Feb 25, 2005 2:51 pm
I wasn't aware that thing was threaded in there. What size drill bit should I use. By hand only, as someone noted. Special order from C&G maybe???
Fri Feb 25, 2005 3:03 pm
Use a #42 drill bit in a pin vise to drill it out. Then re-tap with a 4-48 tap. The tube should not be a special order. I believe they are still shown as available stock items.
Fri Feb 25, 2005 3:58 pm
I remember Jim Becker saying that a lot of carbs out there have had the idle tube broken off and still run just fine. I know when I did the carb rebuild mine was broken off so I put it back the same way. Puuuuurrrs like a kitten.
Fri Feb 25, 2005 5:03 pm
remember Jim Becker saying that a lot of carbs out there have had the idle tube broken off and still run just fine. I know when I did the carb rebuild mine was broken off so I put it back the same way. Puuuuurrrs like a kitten.
Hmmm, if that's the case, what does it do? I'm thinking...leave "well enough" alone then.
Fri Feb 25, 2005 5:25 pm
Yeah......don't want problems later. Im off to look for a #42 drill bit and 4-48 tap.
But..........what does the idle tube do? Puts the air directly down to the main jet?
Fri Feb 25, 2005 10:59 pm
The idle tube draws fuel for the idle circuit. The tractor will run without it but runs better with it.
With my first Cub, the carburetor was a schizophrenic mess. I always used the junky TSC kits with the wrong directions and missing parts and guessed at the settings using an I&T IH-8 manual that didn't have a breakdown of the Cub carb.
I didn't know the elusive idle tube existed until reading HL Chauvin's hints and some very helpful guys here pointed me in the right direction. I got a genuine IH carburetor kit with the proper directions and GSS-1411. The old tube was broken off and "welded" in the well leading to the main jet with corrosion and varnish - it had to be drilled out as well as the threaded stub in the throttle body.
Fri Feb 25, 2005 11:13 pm
If anyone needs to order one of the 4-48 taps they can go to http://www.mcmaster.com
and in the find box type in 2237 (page number) and when you get to the page scroll down to "Chrome Plated Taps".
Fri Feb 25, 2005 11:15 pm
The 4-48 taps are usually available at a gunsmithy shop and fastener places. I bought mine at my local fastener supplier and it cost me a grand total of $2.00 taxes in
Sat Feb 26, 2005 12:42 am
Guess I am lucky, the tube was very easy to remove. I just did it so I wouldn't break it and NOW I see that I must true up the top as it is bent at every place there was a screw.... just like Carl's pictures. So it is a good thing that it came right out.
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