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JD A runs like ... well, not like a Deere, more like a 3 legged turtle

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Bob

10-30-2002 05:57:42




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Still working on my 3 year effort to get the JD A running. Ever since I first tried starting it up after rebuild, it ran rough with little power. Timing is good, plugs new, condenser & points new (and properly set), new coil, carb cleaned, all passages behind brass screws thoroughly reamed out, float level good, throttle shaft checked for air leakage, manifold checked for leakage and inspected for cracks, tried two different gaskets on carb, tried various adjustments on load and idle (makes a difference, but doesn't solve problem). Since I had the carb off, it not only runs rough, but has to have the choke full shut to run at all, which I'd think indicates an air leak, but I sure can't find it. Recleaned carb passages, checked gas flow at carb connection. Finally noticed backflow out of carb, checked rocker adjustment and found #1 intake too tight. Checked compression: none in #1, so it must have been running on 1 cyl. Adjusted rocker, got good, equal compression in both cyls. Started her up, she ran great ... for about two minutes, then coughed, sputtered, and acted just like before. Probably have tried other stuff that I've forgot to mention ... for example, that I've drained and replaced the fuel, and that spark is good, blue, and will jump a quarter inch. BTW, if I crank her over with full choke, plenty of fuel comes out the petcocks, so I know I'm getting gas to the cyls. Any thoughts on what to try next? Got fuel, got spark, got compression. What am I missing?

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Dan-CA

10-30-2002 22:11:57




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 Re: JD A runs like ... well, not like a Deere, more like a 3 legged turtle in reply to Bob, 10-30-2002 05:57:42  
In the sediment bowl assembly there is a fine screen; it may be plugged. The choke on full means not sufficient fuel. My tractor does not get run much, so I use stabilizer in the fuel. You can buy the commerrcial kind or use some kerosene in the fuel like I do. There are some passageways in the carbuerator which may be plugged with varnish from old fuel. You may need to get it rebuilt.



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zane

10-30-2002 17:51:15




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 Re: JD A runs like ... well, not like a Deere, more like a 3 legged turtle in reply to Bob, 10-30-2002 05:57:42  
Sounds like you may still be running on one cylinder. Get it running again and pull one plug wire off at the time. If either wire makes no difference, you'll know where to look. If either wire kills it or makes it worse, I think you have a fuel/air leak problem. You're probably running lean. Confirm by disconnecting the air cleaner and spraying a little ether into the carb intake while the engine's running and the choke and throttle are open.

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Bubba

10-30-2002 12:49:14




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 Re: JD A runs like ... well, not like a Deere, more like a 3 legged turtle in reply to Bob, 10-30-2002 05:57:42  
Your comment that it ran great for about two minutes caught my eye. When this happens, you are probably running out of fuel. Your fuel flow from the tank is less than is required for the engine. If you stop it for a few minutes, the carburetor will re-fill and run. But it will run low on fuel in two minutes. Check your fuel flow from the tank. I would suspect that it is slow and just can't keep up.

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Roy

10-30-2002 10:01:16




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 Re: JD A runs like ... well, not like a Deere, more like a 3 legged turtle in reply to Bob, 10-30-2002 05:57:42  
Bob, if a second compression check on the number 1 cylinder doesn't show anything, I recommend sending the carburetor to Robert's Carburetor Shop in Spencer Iowa. It will cost a bit, but you will have a known good carburetor.



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cheg

10-30-2002 09:52:03




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 Re: JD A runs like ... well, not like a Deere, more like a 3 legged turtle in reply to Bob, 10-30-2002 05:57:42  
I once had a problem similar to yours. The only way I could get the tractor to run was by closing the choke. I was soon educated on the fact that there is a brass fuel nozzle in the carborator with several small holes. I pulled the fuel nozzle out and found most of the holes plugged. There was rust and scale around the nozzle. After I cleaned it, the tractor decided to run.



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Jack

10-30-2002 10:12:39




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 Re: Re: JD A runs like ... well, not like a Deere, more like a 3 legged turtle in reply to cheg, 10-30-2002 09:52:03  
cheg,I thing you just may be right.I too had that same problem and had a professional rebuild my first G carb.A good friend of mine told that most people don't know about the nozzel and the little holes in it so they don't pull it out.My G decided to run after mine was cleaned.I have done four carbs since with no problems.Later,Jack in TN



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Encourager

10-30-2002 08:30:50




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 Re: JD A runs like ... well, not like a Deere, more like a 3 legged turtle in reply to Bob, 10-30-2002 05:57:42  
They shoot horses, don't they?



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Seamo

10-30-2002 06:49:55




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 Re: JD A runs like ... well, not like a Deere, more like a 3 legged turtle in reply to Bob, 10-30-2002 05:57:42  
Post your E-mail or E-mail me so we can walk you through it.Where do you live?? If we make contact give me a call.Earl In Illinois



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Clooney

10-30-2002 06:47:38




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 Re: JD A runs like ... well, not like a Deere, more like a 3 legged turtle in reply to Bob, 10-30-2002 05:57:42  
Bob, you pretty well covered everything.
~The first thing that comes to mind is if it ran good for 2 minutes after you got compression in #1 cylinder then it went back to it's old ways is, the #1 cylinder has the same problem again, [have you RE-CHECKED the compression in #1? ~Install another set of spark plugs just to be sure you don't have a bad one.
~If that isn't the problem then you are about at the parts substitution point. See if you can borrow a different [known good] carb & mag] & try that on your tractor.

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Bob

10-30-2002 08:55:53




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 Re: Re: JD A runs like ... well, not like a Deere, more like a 3 legged turtle in reply to Clooney, 10-30-2002 06:47:38  
I have changed the plugs recently in attempt to fix problem (that's why I listed new plugs) but I can sure try again. I thought about checking the compression again, although since it was an adjustment problem before it doesn't seem likely it'd go out of adjustment so fast (yes, I DID tighten down the nuts on the adjusters!) but a compression check is quick and easy so I'll try it. Swapping parts might be tough, but I think you're right that that's what it's come to. Currently has a D-R distributor I "borrowed" from another junk A because the shaft on the WICO XB it had on it when I got it was broken, but I guess it doesn't really matter WHAT I put on it just to see if it works. Probably DO have access to the distributor off a 70. Did 70's use the same Delco-Remy as late A's? Carb'll be a lot harder to come by, especially a "known good" one, but I'll look around the neighborhood.

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G-MAN

10-30-2002 10:22:12




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 Re: Re: Re: JD A runs like ... well, not like a Deere, more like a 3 legged turtle in reply to Bob, 10-30-2002 08:55:53  
Bob, I would take a good look at the condition of the rocker arm shaft and the rocker itself. I have seen situations in other engines where the shaft and/or arm will get some excessive wear, and make setting and maintaining proper valve lash nearly impossible, which can lead to excessive or insufficient lash and possibly a loss of compression. I'm not an expert, but that's my two cents.



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snowmantn

10-30-2002 22:15:06




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 Re: Re: Re: Re: JD A runs like ... well, not like a Deere, more like a 3 legged turtle in reply to G-MAN, 10-30-2002 10:22:12  

Bob I had the problem G-MAN mentioned with my late A. It can make setting valve lash impossible. Machine shop fixed it in short order though. If you pull the rocker assembly you might want to check valve springs and push rods. You said the motor was fresh. Did you have the camshaft out or replaced? Just grasping at straws.

snowmantn



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