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Adjusting the load needle for a JD A

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Rollo

12-04-2000 17:22:16




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My books say to adjust the "load side needle" while under a load. Makes sense until you think about it...Since I don't have a belt driven device, how do I adjust the load side? I don't see me plowing a field, jumping off the tractor and running along side, adjusting the "load" needle valve. There has got to be some simple solution I don't understand. By the way, it purrs like a kitten since I rebuilt the whole engine and carburetur....at least at idle.

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Wayne Swenson

12-04-2000 21:34:40




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 Re: Adjusting the load needle for a JD A in reply to Rollo, 12-04-2000 17:22:16  
Why not go to a tractor show, tractor pull, or a dealer and put the "beast" on a dynamometer?
We run 30 to 40 dyno tests each year at our show.



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ia dean

12-04-2000 18:25:09




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 Re: Adjusting the load needle for a JD A in reply to Rollo, 12-04-2000 17:22:16  
The most accurate way to fine tune a carb at work load rpm;s is doing plug checks A rich idle mixture will distort reading so kill engine hot. Read plug ,brush it clean, make carb adjustment and start up and go again. You;ll want a brownish color on the insulator. Light brown to grey or white and it;s too lean. Black is too rich. Since you;re on a fresh rebuild , black from burning oil should'nt be a problem.

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Stan

12-04-2000 17:53:11




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 Re: Adjusting the load needle for a JD A in reply to Rollo, 12-04-2000 17:22:16  
Rollo,

Step one is to set the carb at whatever the books say. It's not as quick as it would be with a belt driven load on the pulley, but you need to get the beast up to operating temperature and go out somewhere that you can put it in road gear and let 'er rip. Apply both brakes (evenly) steadily until she starts to miss or pop or whatever. You may have to do adjust the carburetor several times but you should get there eventually.

My '41 B is adusted right when the front end starts to bounce up and down and the engine pulls down to dang near nothing.

Good luck,

Stan

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