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Wants to be choked

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Sam (Mo.)

11-18-1999 18:22:16




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I posted a message about a week ago called "lunging under load", and am still trying to fix that problem. Have just put my 1952 8N back together after having the engine and carburetor rebuilt. It runs great in neutral, but the rpm's go up and down, wildly, under any load.

It's not the governor or linkage - when the governor is disconnected and the throttle is operated by hand, it will hardly run at all. I have checked everything and narrowed it down to the carburetor. In fact, it runs just fine including under load if I just hold the choke out about 1/2 inch. There are no leaks around the intake manifold, and I can't seem to get the carb. jets adjusted so the tractor will pull right without holding the choke out.

It would be easy to make the tractor run right by just putting a bend in the choke rod so the choke won't open all the way, but that wouldn't be fixing the problem. Does anyone have any ideas about what's causing this and how to fix it? Thanks.

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Don

11-19-1999 07:45:11




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 Re: Wants to be choked in reply to Sam (Mo.), 11-18-1999 18:22:16  
I have exactly the same problem only worse. The engine will only run with full choke. My next move is to check the actual float level. If this is not correct, sufficient gas will not be able to enter the carb and this could result in an overly lean mixture??



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Dave

11-18-1999 22:04:20




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 Re: Wants to be choked in reply to Sam (Mo.), 11-18-1999 18:22:16  
It sounds to me like you have an air leak someware between the carb and the engine. Try taking a can of WD40 and with the engine running spray it around the carb mounting area and intake manifold, Also the throttle shaft. I'm new to this Tractor collecting but have over 15 years of mechanicing on outdoor power equipment. When I've run into this kind of problem there it almost always has been an air leak. good luck!

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TimK

11-19-1999 12:37:49




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 Re: Re: Wants to be choked in reply to Dave, 11-18-1999 22:04:20  
I would also bet a good deal of money that it is an air leak, since choking it to make it run is a sign of that. If you can't find the problem in the carb as some of the other responses suggest, I think you have to pull the manifold off and check it closely before re-installing with new gaskets. Pull off the carb and make sure there are no cracks in the throttle body before reinstalling with a new gasket.

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Ace (Ore)

11-18-1999 18:54:59




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 Re: Wants to be choked in reply to Sam (Mo.), 11-18-1999 18:22:16  
Just went through the same thing myself. It was the coil. Your description is exactly what I went through. Good luck. Ace



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ZANE

11-18-1999 18:33:25




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 Re: Wants to be choked in reply to Sam (Mo.), 11-18-1999 18:22:16  
Just because you have a new or rebuilt carb. it still can be clogged up with debri and or water. The first thing I would do is to take the plug out of the bottom of the carburator and let the gas run into and bucket etc. If the gas slows and goes to a drip or less than a full stream them the gas is not coming to the carburator. It can be the screen inside the tank. It can be the screen inside the fuel bowl. It can be the screen in the gas inlet elbow that mounts the gas line to the carburator. You just got to find where the gas is restricted. If it does not run freely for at least 2 or 3 full minutes when the plug is removed from the bottom of the carb then remove the gas ling from the carb inlet and if it runs good there the problem is going to be in the carburator itself or the inlet elbow screen or a restriction at the needle and seat. Don't forget that just a couple of drops of water in the bottom of the carburator will do the same thing and the only way to get it out is to take the carburator apart and blow it out.

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Sam (Mo.)

11-18-1999 18:50:09




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 Re: Re: Wants to be choked in reply to ZANE, 11-18-1999 18:33:25  
Yes, I did all that. Unrestricted flow of gas to the carb., and I blew out all the carburetor passages with air. Except for taking the carburetor halves apart and removing the float, needle pin, and venturi, I didn't take anything else in there apart. It was just rebuilt, and everything inside the carburetor seems brand-new, clean, and wide open.



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