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John Deere Tractors Discussion Forum
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John Deere unstyled B

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BDEERE

01-19-2006 16:40:21




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I just recently purchased a '36 unstyled b.. The tractor is in excellent shape considering that the tractor has never been restored. I bought the tractor not running, it does though turn freely at the flywheel.. I installed a new set of plugs and wires, put fuel in the tank and tried to start it. Of course the tractor did not start.. My question is this.. I think that the tractor is getting spark, I held the spark plug in my hand while turning the crank and it kicked me like a mule.. Even though it did this I cannot see any spark on the plug... even if I hold it onto the frame. Could I have a weak spark? Might I need to change the condenser or points in the mag? I am just looking for some pointers on getting this thing started. I have never really worked on one of these 2 cyls.. Please advise. Thank you in advance for your help..

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Joe MD

01-20-2006 07:20:37




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 Re: John Deere unstyled B in reply to BDEERE, 01-19-2006 16:40:21  
It is very easy to flood these tractors. Try draining out your carb and letting it sit for a while. Then give it a very small amount of gas.

I don't think this year has petcocks, but if it does gas will come out the petcocks as you spin the flywheel and soak your pants. So you can rule out gas supply as a problem.



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sgtbull

01-19-2006 20:47:09




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 Re: John Deere unstyled B in reply to BDEERE, 01-19-2006 16:40:21  
Just a few thoughts.. If this tractor has sat for a long time, you're almost guaranteed to need to take the carb apart and clean it thoroughly. The mag should give a good blue spark approx. 7 mm long or so...shorter will run, but it should be a good healthy blue. Weak magnet or dirty points can really affect the spark. I've always been told that a good mag will run even with a bad condenser, and that the condenser just absorbs excess voltage to keep from burning up the points. 'course, that came from tractor buddies, not guys who rebuild mags for a living. I'd take a good look at the cap too, making sure there aren't any carbon tracks inside that take the current away from where it should be going. There are LOTS of things that can keep it from starting... process of elimination is a pretty good approach. Shotgunning it ends up pretty expensive pretty quick I agree w/ the other reply that indicated that champion plugs generally aren't the best in old Deeres, unless they are the older 3 piece plugs...I have good luck w/ those.

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van robinson

01-19-2006 18:57:45




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 Re: John Deere unstyled B in reply to BDEERE, 01-19-2006 16:40:21  
You may want to check the gap on the plugs. If you have champion plugs, you may want to try a different brand. I have bought some new champs that had broken porcelin and was grounding the electrode so I was not getting a spark where I should. Also, if you have the pressure relief petcocks open, try closing them. My '40 B will not even try to hit when cranking with the cocks open, but does fine with the cocks closed. The condenser may be bad. I bought one from JD for $17 dollars. make sure mag cap is in good shape.
Check to be sure the plug wires are hooked up right. My were backward fro what they should have been when I bought it.

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BDEERE

01-19-2006 20:08:52




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 Re: John Deere unstyled B in reply to van robinson, 01-19-2006 18:57:45  
Thank you for the advice; I am going to replace the condenser and the points hoping that this will give me a stronger spark. Being that my tractor is a B there are no petcocks. I have fuel getting to the carb, at least there is fuel in the bowl of the carb when I open the valve on the bottom of the carb. With luck I can get this thing to fire this weekend.



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JLWhite

01-19-2006 17:26:54




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 Re: John Deere unstyled B in reply to BDEERE, 01-19-2006 16:40:21  
Other things to check are the carburator, and the fuel lines. Is Fuel getting from the tank to the carb and is the carb being primed right? If you pull out your plugs and watch them when someone turn the flywheel (while with dim light) you should see the spark jumping across the plug. If it is not, then you might have a week magnito and it could be taken to a shop that services mags.



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