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Old 07-09-2020, 05:20 PM   #1
LAV
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Default Tillotson air balanced 1928-34 carb

This is a new carb and can’t start. Good fuel getting to the inlet of carb, and the gas flows thru valve great but wont start unless I use starter fluid, then runs and stops. New carb, wouldn’t think I’d have to set the float, but out of ideas. Timing is good and fuel is good. Help. Thanks
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Old 07-10-2020, 05:03 AM   #2
Wick
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Default Re: Tillotson air balanced 1928-34 carb

Air leak. Gasket good between carb and manifold? Engine is pulling air instead of fuel.
That's why the starter fluid works.
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Old 07-10-2020, 02:48 PM   #3
Purdy Swoft
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Default Re: Tillotson air balanced 1928-34 carb

It does sound like what Wick says . I did have a similar problem with a Tillotson model X . .The air adjust screw had to be just right . Usually one and one half turns on the air adjust screw is normal . I had to fiddle with the air adjust screw to find the sweet spot .
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Old 07-10-2020, 03:21 PM   #4
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Default Re: Tillotson air balanced 1928-34 carb

I have a good gasket and have filed down smooth the the manifold and the carb is new. To eliminate the air leak issue. I don’t think it is an air leak. How do I check float level in Tillotson carb?
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Old 07-10-2020, 03:55 PM   #5
Ernie Vitucci
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Default Re: Tillotson air balanced 1928-34 carb

Good afternoon...your air leak could well be between the intake manifold and the block...it has happened to me. Ernie in Arizona
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Old 07-10-2020, 04:09 PM   #6
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Default Re: Tillotson air balanced 1928-34 carb

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Ok, I’ll check that out. Thanks. Any word on how to check float?
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Old 07-10-2020, 04:50 PM   #7
Bruce of MN
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Default Re: Tillotson air balanced 1928-34 carb

This has a tip, not sure where I got it:

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Old 07-10-2020, 05:27 PM   #8
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Default Re: Tillotson air balanced 1928-34 carb

Thanks so much. This is a real help. I am trying to make sure I eliminate any chance of air leaks fore I do anything else.
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Old 07-10-2020, 05:58 PM   #9
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Default Re: Tillotson air balanced 1928-34 carb

A friend installed a "new" air-balanced Zenith he got from one of the vendors. We couldn't figure out why it would not run unless the GAV was open 2+ turns and was real hard to start. Even with the GAV open that far, it ran real lean. Plugs were white.

Turns out this "new, made in USA" carb had excessive clearance in the throttle shaft, thus sucking in air. Might want to check your throttle shaft.
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Last edited by Ruth; 07-10-2020 at 08:15 PM.
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Old 07-22-2020, 02:58 PM   #10
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Default Re: Tillotson air balanced 1928-34 carb

Changed gaskets to check for air leaks; did not help.
I slightly adjusted float and now it will start and run (well) for a short time and dies. I have adjusted the GAV (1 full turn) and the air/gas screw (3/4 turn) to the settings on the instruction sheet. Anybody have ideas on how to proceed, without guessing to find the proper settings? Send the carb back? If so are Zenith’s any better? I want to get this one working. Thanks.
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Old 07-22-2020, 03:22 PM   #11
wmws
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Default Re: Tillotson air balanced 1928-34 carb

Have you tried taking the full line off and letting at least a pint of gas run out. I'm thinking gas cap vent issue. Or possibly the feral on the gas line is letting the gas line enter too far into the carb thereby slowing fuel supply. I'm not sure if that is relevant on a Tilly.
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Old 07-22-2020, 04:39 PM   #12
LAV
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Default Re: Tillotson air balanced 1928-34 carb

Gas into carb is good. Thanks though
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Old 07-22-2020, 05:07 PM   #13
Patrick L.
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Default Re: Tillotson air balanced 1928-34 carb

Was there a problem using the old carb ?

If you choke the heck out of it does the carb throat get wet ?



Ooops, somehow I missed #10. I doubt the problem is float level but its easy to check and adjust. It should set level which should be 1". Adjusting is by bending the float arm carefully.
Tilly's like more GAV opening than Zenith's. Try starting at 1 turn. Idle mix should be as Purdy says, 1.5 turns to start out before adjusting.

Last edited by Patrick L.; 07-22-2020 at 06:49 PM.
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Old 07-22-2020, 07:27 PM   #14
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Default Re: Tillotson air balanced 1928-34 carb

Thanks
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