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JD 50 Carb question

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Dave G

06-20-2001 20:08:56




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What a night. I have been out fighting with my tractor. My JD 50 usually runs perfect. Last time I had it out I adjusted the carb a little to stop the slight high rpm missing under load. Everything was fine until I went to use it tonight. It barely runs no matter where I adjust the screw on the bottom or the 2 idle adjust screws. It backfires, misses, barely runs, sometimes I can run wide open for about 30 sec. All I can think of is that I upset some sediment and plugged up the carb. Any ideas, about where should the high speed screw on bottom and 2 idle screws be adjusted? Any usual problems with these particular carbs?

Thanks all

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Dave G

06-23-2001 15:16:18




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 Re: JD 50 Carb question in reply to Dave G, 06-20-2001 20:08:56  
Well - I think I found the culprit. The intake/exhaust manifold gasket looks like its wet and bubbling in the intake area. Taking it apart I noticed 1 loose bolt. But I'm putting in a new one anyway because I have an exhaust leak on the one side. This would make sense - it would tend to try at run at high rpm but fall down at lower rpms. Thanks for all the help.



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Chuck

06-21-2001 19:38:09




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 Re: JD 50 Carb question in reply to Dave G, 06-20-2001 20:08:56  
A lot of times, carburator problems are blamed on ignition. I installed electronic on all my tractors including my 50 and it made them all come alive....



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Norman

06-21-2001 11:33:58




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 Re: JD 50 Carb question in reply to Dave G, 06-20-2001 20:08:56  
Dave, If all else fails, change the spark plugs. I have a '49 "D" and a '50 "A" that did just that same thing. Drove me bananas. Unplug one wire from the mag/dist and then plug it back in and pull the other. See what diference it makes. I just go to my old plug pile and put one in. If that makes a difference I then put in new one. Anything but Champions.
Might try it.
Norman



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Deere80

06-21-2001 19:25:47




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 Re: Re: JD 50 Carb question in reply to Norman, 06-21-2001 11:33:58  
what's wrong with Champion spark plugs?



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Norman

06-23-2001 05:35:32




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 Re: Re: Re: JD 50 Carb question in reply to Deere80, 06-21-2001 19:25:47  
Deere 80, That is what I have been trying to find out since the 50's when I was playing with Model A Fords. Some people sware by them, some at them.
Norman



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Deere 80

06-23-2001 09:58:48




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 Re: Re: Re: Re: JD 50 Carb question in reply to Norman, 06-23-2001 05:35:32  
OH. Well, since you were the one that stated to use "anything but Champions", I fiqured you had a reason for saying that. I was just curious what your reasoning was/is. Personally, I have ALWAYS used Champions and had great luck with them. I'm in no way sying that you're wrong with how you feel, just curious as to why you feel that way. Keep in touch Norman!



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Norman

06-23-2001 11:35:33




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 Re: Re: Re: Re: Re: JD 50 Carb question in reply to Deere 80, 06-23-2001 09:58:48  

Deere 80, I had trouble getting Champions to fire every time in my old Model A. I restored a '49 "D" and knowing Champions were stock on the John Deere, I ordered what the book called for. Great big dudes. $10.00 apiece. Had to order them so I bought two sets. Tractor started and ran through the break-in. Couple days later I cranked it up and all it would do was miss-fire.
I finally removed the carburator and rebuilt it again. Still no run. I then pulled a wire out of the mag and didn't change the sound much. Pulled the other one and it tried to die. I switched the plugs and the miss went to the other side. Put in the other set and it ran good. Next time I started it, it did the same thing.
No run.Put the old plugs in and it is still going. I don't know what kind of plugs they are. So old you can't read them. Cleaned up and painted a '50 "A". The very same thing happened to it. Only I didn't overhaul the carb on it again. Just changed plugs. ???? Later Norman

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Deere80

06-23-2001 20:34:33




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 Re: Re: Re: Re: Re: Re: JD 50 Carb question in reply to Norman, 06-23-2001 11:35:33  
Thanks for the explanation Norman....if I ever have any troubles like this, I'll be sure to remember this! I've heard of this problem before from other people, but never experienced it first hand. And since they always worked for me, I figured there was no reason to change. Thanks again!



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G Taylor

06-21-2001 10:53:04




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 Re: JD 50 Carb question in reply to Dave G, 06-20-2001 20:08:56  
We run the large adjustable power screw under the carb closed except when pulling on the track. Leaner is cleaner. The two identical idle mixture screws should each be set via rpm drop while running on one cylinder according to the manual. A little lean, up to nearly missing reduces wear on parade tractors. The fuel tank to carb float fuel passages should supply a pencil sized stream if the fuel bowl drain plug is removed. We still have occassional carb problems after two complete flushing/rebuilds after handfulls of clay were added to the fuel tanks at a show.

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Chuck

06-20-2001 20:28:11




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 Re: JD 50 Carb question in reply to Dave G, 06-20-2001 20:08:56  
The screw on the bottom is for high altiude adjustment and is not generally adjusted. The other idle screw set at about 1 turn off closed. The other screw can be about 1=2 turns...sounds like your carb need rebuilding....



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Mike Aylward

06-21-2001 09:12:04




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 Re: Re: JD 50 Carb question in reply to Chuck, 06-20-2001 20:28:11  
Dave, the metering screw is normally adjusted at around 2- 2 1/4 turns open, but the tractor can run anywhere from clear closed to open even more turns. The metering jets are the main limiting factor for fuel delivery in the carburetor, but this metering screw will allow more fuel if necessary. If you are doing only light work with the tractor you can get by with less opening. I would guess that some water or dirt got sucked into the carburetor- likely water. The sump screen in the fuel inlet is pretty fine and will catch most of the dirt in the fuel that gets by the sediment bowl. Check this screen, drain the carburetor and flush it with clean fuel and drain again, clean the sediment bowl and while the sump screen is out at the carburetor inlet check to see that you have a good fuel flow to the carburetor. Also, if your tractor has set outside in the weather it is possible the air cleaner might have gotten some water in it and it got sucked in when you tried to start your tractor. Hope this helps. Mike

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Dave G

06-21-2001 20:17:22




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 Re: Re: Re: JD 50 Carb question in reply to Mike Aylward, 06-21-2001 09:12:04  
Thanks for the input.



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Dave

06-20-2001 21:06:02




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 Re: Re: JD 50 Carb question in reply to Chuck, 06-20-2001 20:28:11  
Does the screw on the bottom need to be closed then? The operators manual calls it the "fuel metering screw". It says to refer to the service manual, but I don't have the service manual yet.

Thanks for the help.



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