Air Intake Tube

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Air Intake Tube

Postby ricky racer » Sun May 03, 2020 1:41 pm

I'm rebuilding an early Cub that is missing the air inlet tube between the air cleaner and the carburetor. The carburetor is not the standard 3/4" IH updraft unit but has a larger body. The OD of the carburetor inlet measures about 1-5/8" in diameter. The outlet on the air cleaner measures 1-1/4" in diameter. I assume the tube between the two also measures 1-1/4" in diameter. Any suggestions on connecting the air cleaner to the carburetor either by purchasing a new tube or with a hose of some sort? If I buy a new tube from TM how do I make the transition from the 1-1/4" tube to the 1-5/8" carburetor? :surrender:
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Re: Air Intake Tube

Postby Bob McCarty » Sun May 03, 2020 2:34 pm

I just measured a Zenith and the OD of the intake is 1 5/8". TM sells the rubber hose that flares at the carb end. That might work unless your carb has something different about it. What brand is it?
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Re: Air Intake Tube

Postby Gary S. » Sun May 03, 2020 3:04 pm

How about going to an good auto parts store with the carb and aircleaner in hand and ask if you can dig through their radiator hoses and see if one fits? The one at TM looks good but it's 38 bucks! You only need a piece between the tube and the carb. When we bought the loboy it already had a zenith on it,some how they found a short section of hose that fits between the two. You need something along the line of this,youll have to google it won't let me link found it at Summit Racing does not say the sizes but you'll get the idea Spectra Premium Fuel Tank Filler Neck Hoses 434-FNH109 price at 13.00 is better too.

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Re: Air Intake Tube

Postby ricky racer » Sun May 03, 2020 3:28 pm

Bob McCarty wrote:I just measured a Zenith and the OD of the intake is 1 5/8". TM sells the rubber hose that flares at the carb end. That might work unless your carb has something different about it. What brand is it?

I assume it's a Zenith but I don't see a name on it unless it's on the back side. I looked all over the TM website but couldn't find the hose you mentioned. Do you have a link? Thanks!
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Re: Air Intake Tube

Postby ricky racer » Sun May 03, 2020 3:31 pm

Gary S. wrote:How about going to an good auto parts store with the carb and aircleaner in hand and ask if you can dig through their radiator hoses and see if one fits? The one at TM looks good but it's 38 bucks! You only need a piece between the tube and the carb. When we bought the loboy it already had a zenith on it,some how they found a short section of hose that fits between the two. You need something along the line of this,youll have to google it won't let me link found it at Summit Racing does not say the sizes but you'll get the idea Spectra Premium Fuel Tank Filler Neck Hoses 434-FNH109 price at 13.00 is better too.


That Spectra hose looks perfect, they just don't say what size it is. Yeah, I don't want to pay $38 for the hose. I might have to hit some auto parts stores and see what I can find. Thanks!
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Re: Air Intake Tube

Postby ricky racer » Sun May 03, 2020 3:32 pm

ricky racer wrote:
Bob McCarty wrote:I just measured a Zenith and the OD of the intake is 1 5/8". TM sells the rubber hose that flares at the carb end. That might work unless your carb has something different about it. What brand is it?

I assume it's a Zenith but I don't see a name on it unless it's on the back side. I looked all over the TM website but couldn't find the hose you mentioned. Do you have a link? Thanks!


Bob, I found it! Yikes! :shock: That's an expensive piece of hose!! But I am missing the tube so that's $18 for a replacement tube. I guess the extra $20 for the hose will save me some time looking for something I can make work.... :wink:
Last edited by ricky racer on Sun May 03, 2020 3:36 pm, edited 1 time in total.
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Re: Air Intake Tube

Postby Barnyard » Sun May 03, 2020 3:36 pm

I found this. The price is just as scary. https://www.yesterdaystractors.com/CUBA ... XQEALw_wcB
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Re: Air Intake Tube

Postby Bob McCarty » Sun May 03, 2020 3:54 pm

Check HamiltonBob's price. Those are for the numbered LoBoys, so I'm not positive they will fit.
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Re: Air Intake Tube

Postby Don McCombs » Sun May 03, 2020 4:01 pm

Zenith carb on Cub...

Zenith 2.jpeg
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Re: Air Intake Tube

Postby Gary S. » Sun May 03, 2020 4:19 pm

Hamilton Bobs is exactly what mine looks like hose wise-
cub carb.jpg

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Re: Air Intake Tube

Postby Dale Finch » Sun May 03, 2020 5:03 pm

Someone posted a different fix which involved using the metal tube with the IH carb diameter hose attached to the tubing, then another larger hose completely over that hose, which fit the Zenith carb. Looked tidy... you really couldn't tell there were 2 hoses coupling the gap. Not perfect but it was cheap.

My 2 Zeniths DO have TM's hose on them.
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Re: Air Intake Tube

Postby ricky racer » Sun May 03, 2020 5:51 pm

Thanks everyone!! Yes, mine is a Zenith carburetor. I sent Hamilton Bob and email since I didn't see exactly what I need on his website. I really appreciate the help guys!!
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Re: Air Intake Tube

Postby tst » Sun May 03, 2020 6:20 pm

if you have the metal tube with the stock IH carb slip another piece of a lower radiator hose over the original hose, it makes a perfect adapter from that hose to the zenith carb

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Re: Air Intake Tube

Postby Slim140 » Tue May 05, 2020 10:19 am

Ricky, you may be able to go to an auto parts store and search there radiator hoses. I've done this for things that need to be necked down and cut the length to fit. It blows the peoples mind when you want to search their stock and not have them look it up on the computer though!
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Re: Air Intake Tube

Postby inairam » Tue May 05, 2020 10:59 am

If you have an early cub may be considering getting an IH carb and using the standard tube. I think the early cubs do not run as well on the zeniths but I am not as familiar with the zeniths do I do not know if they are in as good a shape as my IH carbs.
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