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Tractor Pulling Discussion Forum

john deere A

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A puller

09-29-2004 18:06:50




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I need more gas in my tractor will an big nut carb work on my 36 A or will I be better off to redo the stock one if so what can you do to the stock one




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Tim H

10-01-2004 04:53:19




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 Re: john deere A in reply to A puller, 09-29-2004 18:06:50  
How in the world do you get 530 cubes out of an "A"?
Tim



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hank

10-01-2004 06:58:10




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 Re: john deere A in reply to Tim H, 10-01-2004 04:53:19  
a powerblock bored .125 to 6.125 and a 9 in stroke crank will give you 530.



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Tim H

10-01-2004 13:34:54




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 Re: john deere A in reply to hank, 10-01-2004 06:58:10  
Hank, I can see how you can get maybe .250 more stroke from an "A" crank. Are you piecing 2 cranks together, to get a 9" stroke?
Curious
Tim



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Drew

10-01-2004 15:43:15




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 Re: john deere A in reply to Tim H, 10-01-2004 13:34:54  
Nope, use just one crank. Lots of hours with a welder building up the journals. Then several more hours on a crank grinder hogging the inside of the old journal out. Then after you do all that, you have to straighten it back out after all the heat from the welding.



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Tim H

10-03-2004 05:52:58




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 Re: john deere A in reply to Drew, 10-01-2004 15:43:15  
Wow!!!! So then you have to have pistons made, that has the wrist pin holes moved forward, right?
Thanks for the reply
Tim



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Drew

10-03-2004 09:58:43




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 Re: john deere A in reply to Tim H, 10-03-2004 05:52:58  
Depending on the individual engine combination, you may or may not have to have pistons made. If you can find a piston from another application and close to the right wrist pin size, they can be made to work. It may require that either the piston or the connecting rod have bushings made so the piston and rod share a common wrist pin diameter. Then connecting rod length can be adjusted accordingly to come up with the right compression ratio. A drawback to using John Deere pistons in a stroker is that they have a tall compression height that does not allow for a long connecting rod and can also create problems in long stroke engines with pulling the wrist pin out of the bore at BDC.

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Super Lurker

09-30-2004 06:37:21




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 Re: john deere A in reply to A puller, 09-29-2004 18:06:50  
Better check the rules where you pull, before spending any money. If you pull antique farm stock, alot of clubs don't allow the larger carbs. Big nut G on A's or B's, Farmall M on H's, etc. will get you DQed alot of places.



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Dusty Miller

09-29-2004 19:51:36




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 Re: john deere A in reply to A puller, 09-29-2004 18:06:50  
I have a 51 A JD and if u want more gas it would be easier and cheaper to put a bignut on it because when u redo the stock carb for more gas ull have bout 400 dollars in it. Good Luck!



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hank

09-30-2004 12:25:47




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 Re: john deere A in reply to Dusty Miller, 09-29-2004 19:51:36  
a big nut will cost you 400 unless you have one now. I took a stock a carb and bored right through it. actually bigger than a g is.installed g nozzle and other parts.it cost 25 to have the carb bored and the price of a rebuild kit.This carb supplies more than enough for a 530 cube a.Id never spend the money on a g carb for an a again.



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buickanddeere

10-01-2004 09:06:23




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 Re: john deere A in reply to hank, 09-30-2004 12:25:47  
I can't find my Robert's Carb book at the moment. Do the A and small G carbs use the same size choke and throttle plates as the big nut? If just boring the venturi, use some caution. That little bit of extra top end flow can weaken the off idle and midrange fuel delivery and mixing.



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A puller

09-30-2004 13:49:25




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 Re: john deere A in reply to hank, 09-30-2004 12:25:47  
to look at the two carbs how much difference is in them just by looking . as for being disqualified there is some pretty obvious things getting by in the antique stock classes locally



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Super Lurker

10-01-2004 07:45:39




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 Re: john deere A in reply to A puller, 09-30-2004 13:49:25  
The 2 carbs look the same until you turn it over and look at the nut that holds the bowl on. It's easy to tell why it's called a big nut G carb. All other carbs have a nut about 1 1/16 inch across. The big nut G (DLTX-51) is about 1 1/2 inch across.



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