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Carburetor Adjustment

IH CUB Lo-Boy Series - 154, 184, 185 Forum -- Questions and answers to all of your Lo-Boy related issues.
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outdoors4evr
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Joined: Tue Jul 22, 2008 12:44 pm
Zip Code: 48370
Tractors Owned: 184
Location: Oxford, MI

Carburetor Adjustment

Postby outdoors4evr » Thu May 16, 2013 7:26 am

I need some help with the zenith carburetor adjustments.
When I got the tractor it would miss at an idle, but run great in the midrange & at wide open throttle. I turned in the air adjustment (top of the carb) in to richen it up. That solved the miss at an idle, but now the midrange is not well. It cuts out while accelerating to full throttle. If I turn it back out 1/4 turn, then it goes back to missing at an idle, but the midrange is ok again.

I can't seem to find a place where both run well. Is there a better way to adjust the carb than by tweaking and running it?
184 w/ Creeper & 3-Point
IH 3160a Mower
IH Model 15 Tiller
IH-54 Blade

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Eugene
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Re: Carburetor Adjustment

Postby Eugene » Thu May 16, 2013 7:34 am

Try carburetor cleaner in the fuel. Then operate the tractor for a while before making the carburetor adjustments.
I have an excuse. CRS.

outdoors4evr
10+ Years
10+ Years
Posts: 2784
Joined: Tue Jul 22, 2008 12:44 pm
Zip Code: 48370
Tractors Owned: 184
Location: Oxford, MI

Re: Carburetor Adjustment

Postby outdoors4evr » Fri May 17, 2013 7:01 am

I need help adjusting the carb, not cleaning or rebuilding it.
I finished up the winter tank with 1/2 can of seafoam in it. Filled with fresh gas (no ethanol) last week.

Does someone have a procedure on how to properly adjust the carb?
Are any special tools recommended to help adjust the air to fuel mixture?
184 w/ Creeper & 3-Point
IH 3160a Mower
IH Model 15 Tiller
IH-54 Blade

Eugene
Team Cub Mentor
Team Cub Mentor
Posts: 20344
Joined: Fri Jul 02, 2004 9:52 pm
Zip Code: 65051
Circle of Safety: Y
Location: Mo. Linn

Re: Carburetor Adjustment

Postby Eugene » Sat May 18, 2013 10:04 pm

If my previous, inexpensive, suggestion doesn't work, you will need to completely clean the carburetor. You should also check the ignition system/ignition timing.

Tweeking, your cited adjustment method, is correct for the Zenith carburetors standard on Cubs.
I have an excuse. CRS.

welderskelter
10+ Years
10+ Years

Re: Carburetor Adjustment

Postby welderskelter » Mon May 20, 2013 5:52 am

I agree with eugene. You may have a leaky float so be sure to check that.

Gary Dotson
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Re: Carburetor Adjustment

Postby Gary Dotson » Mon May 20, 2013 6:09 am

The description sounds like you may have a vacuum leak, you might check that.


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