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John Deere Tractors Discussion Forum
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rough running B

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battlin_blazes

09-27-2005 17:01:38




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1939 john deere b runs really rough,back fires, spark plugs are black and dry, black smoke out the exhaust. put new plugs in and tried tweeking carberator adjustments without much success. Its been running great so this is a new problem any ideas on what else i need to try? thanks Rich




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johnny t

09-28-2005 17:44:57




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 Re: rough running B in reply to battlin_blazes, 09-27-2005 17:01:38  
i agree with old. black smoke is always gas problem. blue is oil problem. i have a 48 b and since i run all gas in it and it was orginally an all fuel i switch the metering jet out in it to one for all gas and it made all the difference in the world in how it runs. four or five years ago it was like 35.00 and it didn't even have any green paint on it. i thought when you bought something with jd paint on that is what made it expensive. don't be afaird to rebuild carb. theres not much to just cleaning one up. i actually sandblasted mine years ago and it helped it alot. use the right size screwdriver to remove all brass plugs and run a drill bit down each hole that is exact size of hole and no loger. just turn it by hand is good enough. to remove stubborn brass plugs hat them with a torch and when they flash green stop heating them and sometimes they come out easier when hot or even sometimes better after they cool. good luck. may you and your family be safe guys

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Skyhawk Greg

09-28-2005 12:28:12




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 Re: rough running B in reply to battlin_blazes, 09-27-2005 17:01:38  
To add to what Connor said, disconnect the aircleaner side of the carb, which will eliminate the aircleaner, and see how it runs.



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battlin_blazes

09-28-2005 10:02:33




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 Re: rough running B in reply to battlin_blazes, 09-27-2005 17:01:38  
thanks guys for all the help and ideas, i am assuming its a carberator problem at this time. when I bought the tractor a few years back it was froze up sitting in a barn for nine years and the fuel tanks are full of crud and still to this day I clean junk out of the sediment bowl so maybe something got down stream? I'll have to tear into it and see what we find. But hey for the $200 I have in it I'll take a little misery!! thanks again

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Connor D

09-28-2005 08:16:56




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 Re: rough running B in reply to battlin_blazes, 09-27-2005 17:01:38  
I run into this problem the other day on a A JD it was the air cleaner was pluged with a mouse nest make sure it is getting good air flow.



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Mike M

09-28-2005 05:45:56




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 Re: rough running B in reply to battlin_blazes, 09-27-2005 17:01:38  
Take a really good look at your spark see if it is strong and in time and not crossfireing.



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Marv

09-28-2005 04:35:40




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 Re: rough running B in reply to battlin_blazes, 09-27-2005 17:01:38  
I also have a 39 B. Same problems. I am a little gun shy about rebuilding the carb. I do have a video on how to rebuild. Let us know what your solution was.



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old

09-27-2005 17:53:01




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 Re: rough running B in reply to battlin_blazes, 09-27-2005 17:01:38  
Black smoke means its running way to rich. Sounds like a bad float and or stuck float or junk in the needle valve. In any case a carb rebuild is probably what it needs



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