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John Deere B carb

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Brandon

02-20-2000 20:48:09

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We just got my grandpa's B running, that he got for a Christmas present. It seems to be running rich so we are going to adjust the carb. I have the I&T manual, but don't know which screw is the idle jet, and which is the load jet. The idle jet is supposed to be brass, and the load jet is supposed to be "cadmium", but the carb is a little too dirty to tell. Looking from the left side of the tractor, which jet is which. Its a '46 B, 184580. Thanks

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Pappy

02-20-2000 20:59:58

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Re: John Deere B carb in reply to Brandon, 02-20-2000 20:48:09

The adjustment on the left, or outside, is the idle adjustment. The inside, or right, is the load adjustment. Start by opening the outside needle about 1.50 turns from stop. Open the inside needle about 1.25 turns from stop.

This will give you a starting point. Both settings will have to be adjusted after it warms up. Run it at fast idle and adjust the outside needle until it runs smoothly. The inside needle will have to be adjusted properly when pulling some type of load.

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