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Restoration & Repair Tips Board

JOHN DEERE B CARBURETOR

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Timbo

01-20-2006 07:58:42




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Hello everyone, I posted this in another forum as well as this one because I need "BIG TIME" help. I'm restoring a 1949 John Deere B. I removed the carburetor, dissasembled it,placed it in a tank with solvent to soak for two weeks. Cleaned all the passages that I know of, reassembled with a new throttle shaft, felt seal on shaft, new needle and seat, new float, and gaskets. the tractor idles fine, but if you open the throttle quickly or the governor opens the throttle quickly, it runs very rich, smokes black and stalls out. If you open the throttle slowly, it will run at fast idle just fine. Did I miss cleaning an oriface? Could someone have installed an ALL-FUEL main jet? PLEASE HELP!!!!!

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Wisconsin Bill

01-21-2006 14:17:05




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 Re: JOHN DEERE B CARBURETOR in reply to Timbo, 01-20-2006 07:58:42  
Do you have the carb kit instructions? If it lists the jet settings, start there. An old rule of thumb is lightly seat the main and idle jets; back out each about 1 turn. If it already started and idled, the idle jet MAY be fine, so adjust the main to specs. Is the choke opening? Or is there a kink in choke cable or obstruction that it isn't closing--I am figuring engine is 'warmed-up' when you are getting that 'rich' condition. Or is it getting enough air-is there an obstruction in air getting to carb? Sometime critters get into this circuit.

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old

01-20-2006 10:15:43




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 Re: JOHN DEERE B CARBURETOR in reply to Timbo, 01-20-2006 07:58:42  
Sounds like you have the load or main jet set way to far open. You need to start it up and turn it in a little at a time to see if that helps. If you get it turn all the way in and it still does that you probably missed something it there. I don't know that carb to well but all of them work the same and I'm pretty good at getting them to work right. Last time I was in a carb for a JD-B was probably 10 years ago or more, but I do own one, a B that is.

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Timbo

01-21-2006 07:16:02




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 Re: JOHN DEERE B CARBURETOR in reply to old, 01-20-2006 10:15:43  
Thanks Old, I'll take it apart again and take a look at the load needle seat and check it out.



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