Changed the carb float.

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jsfarmall
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Changed the carb float.

Postby jsfarmall » Tue Dec 05, 2017 9:49 pm

I changed the float in my ih carb today. Took a bit to get it adjusted right but finally.got it to run right. Now she is more cold natured than before. Have to let the engine warm up longer than before but still.pretty easy to start. What would have caused this?

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Don McCombs
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Re: Changed the carb float.

Postby Don McCombs » Tue Dec 05, 2017 11:15 pm

Probably the old float/adjustment allowed the carb to run rich.
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Re: Changed the carb float.

Postby outdoors4evr » Wed Dec 06, 2017 7:40 am

The old float allowed a higher fuel level in the bowl. I would guess that the old float might have had a hole in it and had fuel in the float which lowered the float level. This allowed "too much" fuel to be in the bowl.

Perhaps your new float level is adjusted a bit too low? Did you do the measurement without the gasket?
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jsfarmall
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Re: Changed the carb float.

Postby jsfarmall » Wed Dec 06, 2017 2:20 pm

I first set to the specified levels. Wouldn't get near enough fuel. Had to keep the choke to make it run. Got it set as high as I can and it runs great. Just a little more cold.natured.

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Re: Changed the carb float.

Postby Glen » Wed Dec 06, 2017 6:27 pm

Hi,
I don't know if you took the main jet out and cleaned it, if the mixture is too lean, it could be dirty.
The carburetor should work right with the float level, and drop, set to the specs in the Cub service manual.
The main jet is the brass colored 6 sided part on the lower side of the carb. It screws out of the carb. The 1st pic below shows where it is.
Clean it with a small wire, the 2nd pic below shows how, then wash it out.
Tighten everything on the carb gently, the metal is soft, and threads can strip out.
If you set the float as high as it will go, gas might run or drip out of the carb when the Cub is sitting. :)
Attachments
Cub carb 3.jpg
Cub jet.jpg
Last edited by Glen on Sat Dec 09, 2017 6:35 pm, edited 1 time in total.

jsfarmall
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Re: Changed the carb float.

Postby jsfarmall » Sat Dec 09, 2017 10:43 am

Cleaned everything and for float height I thought the same. First time I ever seen this carb not leak so I left it alone lol. It's not to the book and I try to stay as close as possible but also when something is working I leave it lol.


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