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I thought of that

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ron,ar

07-20-2006 20:30:59

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Idle and main jets are not the same size externally. I am confused by both the picture I posted concerning the location of the main jet and also the folowing statement in Don Stewart's article: "Next to the float seat is the idle jet seat. This is the jet into which the idle screw/needle fits when the carburetor is running on your tractor" Knowing that the idle mixture screw is installed from the right side of the carb makes that statement confusing. Actually the tractor runs pretty good with the high speed screw out about 6 rounds but I am the kind of guy that wants to know why mine has to be out so dang far to make it right.

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souNdguy

07-20-2006 20:46:34

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Re: I thought of that in reply to ron,ar, 07-20-2006 20:30:59

Out that far is alot of enrichment... Makes me think mainjet clog.. fuel source obstruction, or a WAY lean condition due to leaking gaskets or a cracked casting... ( manifold crack.. manifold gasket.. carb to manifold gasket.. carb halves gasket.. etc.

Try the propane or ether trick to check for vacume leak...

The fact that it doesn't seem to be running rich with the main needle out that much means that it either isn't getting all that fuel due to the clogged jet or the obstruction.. or that the mix is so lean.. that it needs that much enriching to work ok.. that's my uneducated guess and 2 cents anyway...

Soundguy

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ron,ar

07-20-2006 20:57:45

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no main jet clog in reply to souNdguy, 07-20-2006 20:46:34

I had that carb apart again today, re-cleaned and used compressed air on all passages. I sprayed carb cleaner thru all the passages including the idle and main circuits. Everything is open. I am leaning (no pun intended) toward a too lean mixture from a vacuum leak. Manifold is the only source I have not examined. New gaskets on carb halves and carb to manifold. I also resurfaced the carb halves by using a sheet of sandpaper on a sheet of glass. They are true. Gaskets seal good and I changed throttle shaft seal. I'm missing something here but I can't see it. I've had less trouble rebuilding Allison automatic transmissions :^(

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souNdguy

07-20-2006 21:10:19

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Re: no main jet clog in reply to ron,ar, 07-20-2006 20:57:45

Use propane torch (unlit) wd-40 or start fluid, and start tractor, and hose down the manifold to block areas.. see what you get.

Very ocasionally I get debri that the spray carb cleaner won't cut.. but the dip style cleaner cuts easilly.. though I'm sure you've cleaned it good... just mentioning it.. etc.

Soundguy

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ron,ar

07-20-2006 21:35:18

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yep in reply to souNdguy, 07-20-2006 21:10:19

I soaked her overnight in a new tub of gunk. That stuff has not gotten any better smellin either, ya still have to wear it off, no amount of soap and water will rid you of the odor. Gnight folks, thanks for the ideas.

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souNdguy

07-20-2006 21:40:15

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Re: yep in reply to ron,ar, 07-20-2006 21:35:18

Yep.. I use the chemtool dip.. and it not only eats yer skin off.. but as you point out.. makes ya smell bad for days on end..

Soundguy

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Dixon

07-20-2006 22:00:21

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Re: yep in reply to souNdguy, 07-20-2006 21:40:15

now I'm gonna throw my 2 cents worth in.I'm sorry I didn't see or here what your problem is but useing Gunk carberator cleaner won't help you.I've used it and you could leave a carb in there for a week and still have dirt.Go to NAPA and tell them you want some of the good stuff,Its not cheap but it'll clean her.oh and if shes still not fixed restate the problem and let everyone hash it over again I have faith these guys will figure it out.

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souNdguy

07-20-2006 22:35:56

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Re: yep in reply to Dixon, 07-20-2006 22:00:21

I use the chemdip myself. Takes paint of instantly, disolves rubber in seconds.. starts eating plastics on contact... turns skin white in about 5 minutes.. and leaves a smell kinda like kerosene for hours to days afterwards..

soundguy

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