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JD G Carb

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James

01-11-2002 08:34:41




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I have a 1946 GM JD that is a running tractor. It has the higher compression pistons. My question: someone has put a DLTX - 71 (A) carburetor on it. Should it have a big nut 51 on it? If I decide not to change it, will it hurt the tractor's power?




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Mike

01-12-2002 01:21:08




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 Re: JD G Carb in reply to James, 01-11-2002 08:34:41  
I had a 71 carb on a 45 G for a while, worked fine. I picked up a super-clean 51 carb for 285 bucks, they're hard to find



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Deere Puller

01-11-2002 10:50:17




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 Re: JD G Carb in reply to James, 01-11-2002 08:34:41  
For a stock "G", the DLTX-71 is a great carb. The venturi profile of the 71 allows for increased air velocity, which serves to help the carb produce a denser fuel charge due to the cooling effect. You will lose a miniscule amount of power at very low lugging speed, when the air velocity does not compensate for the slightly bigger passages in the 51, but that's fairly rare. At rated speed, down to approx 650 RPM, I've had several "G"'s outperform a 51 with a 71, all on the dyno. You will need to adjust the idle a tick or three richer, but that's about it.

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Steven Koser

01-11-2002 10:06:31




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 Re: JD G Carb in reply to James, 01-11-2002 08:34:41  
James, this is a subject that I have some experience with. I also have a 1947 G with the high compression pistons that I bought with an A carb. on it. Your G will run ok with that carb, but under a real hard load or pull you will lose a little power, however, it won't be as much as most people would think. If you want the tractor to look fairly original, let that carb on or buy a small nut carb. If you want maximun power, buy a big nut carb. Hope this helps, Steve

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