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John Deere Tractors Discussion Forum
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'41 B uneven running

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green shirt

10-17-2003 17:05:32




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my '41 "B" does not run correctly even after a carb. rebuild (and a re-check over by another mechanic). I've run it with 2 different mags-- and the performance is no different. What to do next??? Friends (none of which are credible mechanics) tell me it is sucking air somewhere, but I've not found evidence of that. Others have suggested checking the valve springs. Any other suggestions??? thanks for your help!!

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DRL

10-18-2003 22:22:33




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 Re: '41 B uneven running in reply to green shirt, 10-17-2003 17:05:32  
When you say that it does not run correctly, do you mean that it does not idle properly, or that it does not perform well under load? All of the old two cylinder tractors with the single barrel carbs will not idle out just exactly right due to the firing order. Left hand cyl. fires first, then 180 degrees right hand fires, then there is a full one and a half revolutions before the left hand fires again. The right side usually starves a little bit due to this firing order during idle, thus it will miss out on a regular basis. Put the tractor under load, and this problem resolves itself. This is why the ole two bangers were called johnny poppers. Hope this helps. When I was new to JD's, I went through two carbs, a mag rebuild and a head replacement, just to find out that I was trying to correct a problem that didn't exist.

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R. Marg

10-17-2003 18:43:53




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 Re: '41 B uneven running in reply to green shirt, 10-17-2003 17:05:32  
have you checked timming? and as far as sucking air you can spray oil around all of the joints where it might be sucking air and that will find out where if it is also you do know that the B is a hit and miss engine don't you just asking not meaning to make you look well you know let me know I've had problems like that before and it can be hard to find at times



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green shirt

10-17-2003 19:24:38




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 Re: Re: '41 B uneven running in reply to R. Marg, 10-17-2003 18:43:53  
yes, the timing is on tdc, which i believe is correct. i have not applied oil to possible places where air may be getting in but i will---good suggestion. I did, though, replace the manifold gasket and thoroughly cleaned the mating surfaces.

your help is much appreciated. any additional ideas???



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