J.D. A not running smooth

whigg

Member
I am working on an A and it runs but it wants a little choke.It has a new carb on it. At idle it hunts up and down but dose not stall. At full throttle it is pretty good.Not sure how to fix this
problem.Kind of new at John Deere . Thank you for any help on this matter.
 
First the CARB needs a complete OVER HAUL , NEW or not it is not right , send it to POP IN JOHN and your troubles over, yea there are others in the BUSS but he is the FIXER MAN just ask around on here.1-845-626-5870
 
Adjust the idle screw on the carb while it is running to see if things clear up. I would try in first if it wants choke (in other words increase fuel to engine at idle).

The screw should be on the under side, close to the engine, on the carb. Mine looks like an upside down T on my JD 70's dual barrel carb, but I dont know if it looks the same on the older single barrel carbs.

Just because it is new or newly refurbished, doesn't mean the settings for the idle and load screws are right.

Matt
 
This reminds me of the time a fellow keep complaining about how his A did not run right. Turns out I stopped by his place for a look. ( this is a shortened version ! ) He said there has to be something wrong with this A yet as it just doesn't run as smooth as my 60. Well DUH ! That's why the 60 has a 2 barrel carb. I then had to explain all this to him and assured him a model A never ever will run as smooth as a 60.
I would try some idle & load needle adjustments first to see if you can richen it up enough as to fully open the choke.
 
(quoted from post at 15:21:48 10/06/15) I am working on an A and it runs but it wants a little choke.It has a new carb on it. At idle it hunts up and down but dose not stall. At full throttle it is pretty good.Not sure how to fix this
problem.Kind of new at John Deere . Thank you for any help on this matter.
This is my experience with a 1 bbl DLTX71. There seems to be two overall causes for poor idling. One being the carburetor's inability to draw fuel out of the bowl to match air volume. Checks for this problem are a clogged internal idle circuit. Carburetor needs to be disassembled and all the small drill plugs removed, then clean out whatever (usually rust) and blow out the small holes. If the idle screw is turned in too far it can make the engine hunt, turn it out a 1/2 turn and see if it straightens out. If the float setting a little too low, it could starve the idle circuit, especially if the fuel line, sediment bowl, gas tank are also somewhat clogged. These things are all related to starving the carburetor bowl for the proper level of gasoline which can momentarily uncover the idle opening, then when the engine hunts, there is enough draw to help fill the bowl, it becomes a "hunting" cycle. 2nd is a carburetor or carburetor/intake lack of seal where added air is being drawn in after the fuel. Air can leak by a poor throttle shaft felt seal or sometimes the 60 yr old flange faces on the carburetor or intake manifold are so pitted and rough a thin gasket cannot seal. The kits usually have both a thick and thin gasket, or, even stack two gaskets to seal up all the little crevices. Sometimes the flange faces are bowed inward from many years of tightening. Either mill them flat or take a wide flat face file and carefully hand fit the flange flat again. Overall the carburetors are quite simple and if a small idle screw adjustment does not solve the problem, its time to take stuff apart and look elsewhere.
 
Thank you everyone for the help It turned out to be a bad gasket after the carb. Back in business.
 

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